Table 5.23 — ECs with labels beginning with S
Label Concept definition Figure(s) Code
SABKHA A natural <TERRAIN_DEPRESSION> in an arid or semi-arid <TERRAIN_SURFACE_REGION> the bed of which is covered with salt encrusted clayey <SOIL>; sabkha.   1051
SAFARI_PARK An <ANIMAL_PARK> in which wild <NON_HUMAN_ANIMAL>s are allowed to roam free in an environment designed to resemble their natural habitat and are observed by visitors riding through the <PARK> in <MOTOR_VEHICLE>s; a safari park.   1052
SAFETY_FAIRWAY A <WATERBODY_ROUTE> established for the safe passage of <VESSEL>s through either offshore <PETROLEUM_FIELD>s or <MINEFIELD>s; safety fairway.   1053
SAILING_VESSEL A <WATER_SURFACE_VESSEL> that is primarily moved by the force created by the effect of the <WIND> on attached sails; sailing vessel.   1054
SALT_EVAPORATOR A shallow <RESERVOIR>, which is normally man-made, that is used for the natural evaporation of <WATER> for the collection of salt; a salt evaporator.   1055
SALT_PAN A flat <TRACT> covered by natural salt deposits on its <SURFACE>; a salt-pan.   1056
SANATORIUM A <FACILITY> that houses an institution for the treatment of chronic diseases or for medically supervised recuperation; a sanatorium.   1057
SAND A <MATERIAL> consisting of fine <PARTICLE>s of <ROCK>s (mainly siliceous); sand [SOED, "sand", 1.a].   1058
SAND_BAR A bar and/or low <RIDGE> of <SAND> along the <SHORE> of a <LAKE>, <RIVER>, or <OCEAN> that is built-up to the <WATERBODY_SURFACE> by <WATER_WAVE>s or <WATER_CURRENT>s [APDS, "sand-bar"].   1059
SAND_DUNE A mound or <RIDGE> of loose <SAND> formed by the <WIND>; a sand dune [SOED, "dune"].   1060
SAND_DUNE_REGION A <TRACT> covered by <SAND_DUNE>s; a sand dune region.   1061
SAND_LINE A <LINE> that delineates a <TRACT> of <SAND> from an adjacent <WATERBODY> and that is covered and uncovered depending on the <<ELEVATION>> of its <SURFACE> and the current <<ELEVATION>> of the <WATERBODY_SURFACE>; a sand line.   1062
SATELLITE A <CELESTIAL_BODY> that revolves around a larger <CELESTIAL_BODY>, usually a <PLANET>; a satellite [SOED, "satellite", A.2.a].   1063
SATELLITE_GROUND_STATION A <STRUCTURE> with an associated <AERIAL> used for tracking, control, transmission, and/or reception of signals from <ARTIFICIAL_SATELLITE>s; a satellite ground station.   1064
SATURN The primary <PLANET> of the <SUN> that is sixth in distance from the <SUN>, with an orbital mean <<RADIUS>> of approximately 1 429,4 million kilometres; Saturn.   1065
SAWMILL A <BUILDING> where <LOG>s are processed into lumber; a sawmill.   1066
SCENIC_LOOKOUT A <LOCATION>, which is generally elevated, with <FACILITY>s for observing the scenery; a scenic lookout.   1067
SCHOOL_BUILDING A <BUILDING> used for instruction; a school building.   1068
SCIENCE_BUILDING A <BUILDING> supporting scientific experimentation or research, including scholarly investigation or inquiry, intended to ultimately result in commercial products; a science building.   1069
SCIENCE_FACILITY A <FACILITY> including one or more <SCIENCE_BUILDING>s; a science facility.   1070
SCRAPYARD A <TRACT> used to collect scrap metal for reprocessing; a scrapyard.   1071
SCRUB_LAND A <TRACT> covered by uncultured <PLANT>s that may have some woody tissue; scrub land.   1072
SEA A salty <WATERBODY> more or less confined by continuous <LAND> or chains of <ISLAND>s and forming a distinct <REGION>; a sea.   1073
SEAL_POD A <POD> of seals.   1074
SEAMOUNT A <WATERBODY_FLOOR_PINNACLE> rising 1 000 metres or more from the <WATERBODY_FLOOR> of a <SEA> or <OCEAN> and of limited extent across its summit; a seamount.   1075
SEAPLANE An <AIRCRAFT> capable of taking off and landing on a <WATERBODY_SURFACE>; a seaplane [SOED, "seaplane"].   1076
SEAPLANE_BASE A <FACILITY> supporting <SEAPLANE>s; a seaplane base.   1077
SEAPLANE_RUN A designated <WATERBODY_SURFACE_REGION> outlined by visual markings used by <SEAPLANE>s to land and take off; a seaplane run.   1078
SEAWALL A <WALL> built to protect a <SHORE> from erosion; a seawall.   1079
SEAWEED A <REGION> of large green, brown, or dark red <VEGETATION> (for example: kelp and/or seaweed) growing in a salt <WATER>, typically cold, environment.   1080
SEDIMENT Unconsolidated <MATERIAL> composed of <PARTICLE>s deposited from either a suspension in <AIR>, <ICE>, or <WATER> or from solution in <WATER>; sediment [SOED, "sediment", 3].   1081
SELF_PROPELLED_ARTILLERY Self-propelled <FIELD_ARTILLERY>.   1082
SEMINARY A <FACILITY> used as a school, especially a theological school, for the training of priests, ministers, or rabbis; a seminary [AHD, "seminary", 1.a].   1083
SENIOR_CITIZENS_HOME A residential <BUILDING> housing a group of elderly <HUMAN>s; a senior citizens home.   1084
SET A possibly empty collection of distinct <OBJECT>s; a set.   1085
SETTLEMENT A concentration of <DWELLING>s that is smaller in size than a <TOWN>; settlement.   1086
SETTLING_POND A small <RESERVOIR> where solid matter is precipitated from a liquid by evaporating or settling; a settling pond.   1087
SEWER An artificial channel or conduit, usually covered and under the <TERRAIN>, for carrying off and discharging waste, storm <WATER>, and/or refuse from <BUILDING>s and <BUILT_UP_REGION>s; a sewer [SOED, "sewer", 2.a].   1088
SHADOW A <REGION> of partial darkness produced by a material <OBJECT> intercepting rays of light (for example: the direct rays of the <SUN>); shadow.   1089
SHANTY_TOWN A <TOWN>, or a section of a <TOWN>, consisting chiefly of shacks; a shanty town.   1090
SHARP_CURVE A curve along a <LAND_TRANSPORTATION_ROUTE> that may cause restrictions in traffic of <GROUND_VEHICLE>s; a sharp curve.   1091
SHEAR_LEGS Two or three spars standing on end and lashed together aloft that serve as a derrick or tripod to lift heavy weights, to step or lower <MAST>s or stacks, or for similar marine purposes; shear legs.   1094
SHEAR_WALL The <WALL> of the <EXCAVATION> within a <QUARRY> or <EXTRACTION_MINE>; a shear wall.   1092
SHED A relatively small <BUILDING>, which usually has one or more open sides, that is typically used for storage; a shed.   1093
SHELLFISH_BED A <REGION> in a shallow <WATERBODY> where shellfish breed and may be cultivated; a shellfish bed.   1095
SHELTER A <STRUCTURE> for protecting <EQUIPMENT> or <HUMAN>s; a shelter.   1096
SHIPYARD A <FACILITY> where <VESSEL>s are built or repaired; a shipyard.   1097
SHOAL A <MARINE_REGION> over which there is a <<WATER_DEPTH>> of twenty metres or less, and which is composed of unconsolidated <MATERIAL>, except <CORAL> or <ROCK>; a shoal.   1098
SHOPPING_CENTRE A group of <RETAIL_FACILITY>s, often including <RESTAURANT>s and other businesses, having a common <VEHICLE_LOT>; a shopping centre [AHD, "shopping center"].   1099
SHORE The narrow <TERRAIN_STRIP> in immediate contact with a <WATERBODY>, including the <TRACT> between high and low water <LINE>s; a shore.   1100
SHORE_PROTECTION_STRUCTURE A <STRUCTURE> that protects a <HARBOUR> or <SHORE> from the forces of the <SEA>.
EXAMPLES     <BREAKWATER>, <GROIN>.
  1101
SHORE_REVETMENT A <REVETMENT> placed along a <SHORE> to stabilize the <WATERBODY_BANK> and to protect it from the erosive action of flowing <WATER>.   1102
SHORELINE The <LAND_WATER_BOUNDARY> between the <SHORE> or <BEACH> and a defined mean water level; a shoreline.
EXAMPLE     The high water shoreline would be the <LAND_WATER_BOUNDARY> with mean high water.
  1103
SHORELINE_CONSTRUCTION A fixed (not afloat) artificial <STRUCTURE> attached to a <SHORE> and normally used for berthing and protection of <VESSEL>s; a shoreline construction.   1104
SHORELINE_LANDING_PLACE A <REGION> on a <SHORE> where landing from a <WATERBODY> is possible; a shoreline landing place.   1105
SHORELINE_LANDING_STAIR A <STAIR> on a <SHORE> constructed to connect between the <LAND> and the <WATERBODY> on different levels; a shoreline landing stair.   1106
SHOVEL An <EXCAVATING_MACHINE> that moves <MATERIAL>s by a scooping action; a shovel.   1107
SHRIMP_BED A naturally occurring, significant grouping of shrimp that persists over a significant period; a shrimp bed.   1108
SHRINE A <WORSHIP_PLACE> or place for devotion; a shrine [SOED, "shrine", 6].   1109
SHRUB A low growing, multi-stemmed woody <PLANT>; a shrub [AHD, "shrub"].   1110
SIDEWALK A paved pedestrian walkway, usually made of concrete, typically located adjacent and parallel to a <ROAD>; a sidewalk.   1111
SIPHON A <PIPE> used for conveying liquid from one level to a lower level, using the liquid pressure differential to force a column of the liquid up to a higher level before it falls to the outlet; a siphon [SOED, "siphon", 2.a].   1112
SITE The <LOCATION> of an actual or planned <NON_EMPTY_SET> of <STRUCTURE>s; a site [AHD, "site", 1].   1113
SKI_JUMP A <RAMP> used for ski jumping; a ski jump.   1114
SKI_TRACK A <ROUTE> prepared for skiing; a ski track.   1115
SKYLIGHT A small <APERTURE> filled in with a transparent or translucent <MATERIAL> (for example: glass) that admits daylight through a <ROOF> and/or <ROOM_CEILING>; a skylight.   1116
SLIPWAY A <RAMP> for launching and recovering <VESSEL>s; slipway.   1117
SLOPE_REGION A <TERRAIN_SURFACE_REGION> where the <<TERRAIN_SLOPE>> is within a set range of values.   1118
SLUDGE_GATE A <DEVICE> used to regulate the flow of sludge from a <SETTLING_POND>; sludge gate.   1119
SLUICE An open, inclined conduit for <WATER> that is fitted with a <SLUICE_GATE> and may be employed in mine ore washing operations; a sluice.   1120
SLUICE_GATE A <DEVICE> used to regulate the flow of <WATER> in a <SLUICE>; sluice gate.   1121
SMALL_CRAFT_FACILITY A <FACILITY> with functions or services generally of interest for small craft or pleasure <WATER_SURFACE_VESSEL>s.   1122
SMALL_HAIL <HAIL> with an <<OUTSIDE_DIAMETER>> less than 0,64 centimetre, which is a form of <ICE_PELLETS>; small hail (US).   1123
SMOKE A visible <NON_AQUEOUS_CLOUD>, <PLUME>, or <PUFF> composed of carbon and other <PARTICLE>s given off by burning or smouldering <MATERIAL>s; smoke [SOED, "smoke", A.1].   1124
SMOKESTACK A <COMBUSTION_PRODUCT_DISCHARGE_STRUCTURE> consisting of a large, tall <PIPE> which is often free-standing; a smokestack [AHD, "smokestack"].   1125
SNAG A stem or trunk of a <TREE> below a <WATERBODY_SURFACE>; a snag.   1126
SNOW_GRAINS <SOLID_PRECIPITATION> of very small opaque white <PARTICLE>s of <ICE> that fall from a <CLOUD> and are fairly flat or elongated with <<OUTSIDE_DIAMETER>>s generally less than 1 millimetre; snow grains. Snow grains are the solid equivalent of <DRIZZLE>.   1127
SNOW_GROUND_COVER The layer formed by <SNOW_PRECIPITATION> as it accumulates on the <LAND>; snow ground cover.   1128
SNOW_PRECIPITATION <SOLID_PRECIPITATION> composed of white or translucent crystals of <ICE> that are chiefly in complex branch hexagonal form and are often agglomerated into snowflakes; snow precipitation.   1129
SNOW_REGION A <REGION> in which <SNOW_PRECIPITATION> is falling.   1130
SNOW_SHED A <PROTECTION_SHED> against slides of <SNOW_GROUND_COVER>; a snow shed.   1131
SNOWFIELD A <TRACT> covered by <SNOW_GROUND_COVER>; a snowfield.   1132
SODA_EVAPORATOR A shallow <RESERVOIR>, normally man-made, used for the natural evaporation of <WATER> for the collection of soda; soda evaporator.   1133
SOIL A <MATERIAL> composed of fragmented <PARTICLE>s of <ROCK>, decomposed <PLANT>s, <WATER>, and <AIR> that typically comprises a thin top layer of the <LAND>; soil [SOED, "soil", 4].   1134
SOLAR_PANEL A <NON_EMPTY_SET> of solar cells for converting sunlight into electrical energy or heat; a solar panel.   1135
SOLAR_SYSTEM A <STAR> and its family of <PLANET>s, natural <SATELLITE>s, <ASTEROID>s, and <COMET>s that are captured by its gravity; a solar system.   1136
SOLID_MESH A <MESH> with a related <MESH_SOLID_SET>; a solid mesh.   1137
SOLID_PRECIPITATION <PRECIPITATION> of <ICE>; solid precipitation.   1138
SOUND_CHANNEL A horizontal layer in a <WATERBODY> that is bounded by levels at which the <<WATERBODY_SOUND_SPEED>> is greater than at any level within the layer; a sound channel.   1139
SOUND_CHANNEL_AXIS The alignment axis in a <SOUND_CHANNEL> determined by the <<DEPTH_BELOW_WATERBODY_SURFACE>> at which the minimum <<WATERBODY_SOUND_SPEED>> occurs.   1140
SOUNDING A measured <<WATER_DEPTH>> or spot <<WATER_DEPTH>>; a sounding.   1141
SOUNDING_DATUM The vertical, typically tidal, <SURFACE_DATUM> to which <SOUNDING>s and <<HYDROGRAPHIC_DRYING_HEIGHT>>s are referenced; sounding datum. A sounding datum is usually taken to correspond to a low water stage of the <TIDE>.   1142
SPACE The <REGION> extending in all <DIRECTION>s in which all matter lying outside celestial body <ATMOSPHERE>s is located; the near vacuum occupying the <REGION>s between <CELESTIAL_BODY>s; space [SOED, "space", II.12.a].   1143
SPACECRAFT A <VEHICLE> operating mainly in <SPACE>; a spacecraft [SOED, "spacecraft"].   1144
SPACEPORT A <FACILITY> for the launch, and sometimes the landing, of <SPACECRAFT>; a spaceport [SOED, "spaceport"].   1145
SPECIAL_ELECTRONIC_WINGED-
_AIRCRAFT
A winged <AIRCRAFT> designed or designated for special electronic operations.   1146
SPECIAL_OPERATIONS_HELICOPTER A <HELICOPTER> designed or designated for special operations.   1147
SPECIAL_USE_AIRSPACE An <AIRSPACE> identified by a delimited <REGION> where activities must be confined because of their nature and/or where limitations may be imposed on <AIRCRAFT> operations not associated with those activities; a special use airspace.   1148
SPECIAL_USE_AIRSPACE_COMPONENT A <COMPONENT> of a <SPECIAL_USE_AIRSPACE>.   1149
SPILLWAY A passage for surplus <WATER> to run over or around a <DAM>; a spillway.   1150
SPORTS_ARENA An arena with tiered seats or terraces for spectators of athletic or sporting events; sports arena [SOED, "stadium", 3].   1151
SPOT_ELEVATION A designated <LOCATION> with an <<ELEVATION>>; a spot elevation.   1152
SPRING A natural outflow of <WATER> from below the <LAND>; a spring.   1153
SPRING_TIDE A <TIDE> of increased range (or tidal <WATER_CURRENT>s of increased <<WATER_CURRENT_SPEED>>) occurring semi-monthly as the result of the <MOON>being new or full; spring tide [TCG, "spring tides or tidal currents"]. The spring range of <TIDE>is the average range occurring at the time of spring <TIDE>s and is most conveniently computed from the harmonic constants. It is larger than the mean range where the type of <TIDE> is either semi-diurnal or mixed, and is of no practical significance where the type of <TIDE> is predominantly diurnal.   1154
STADIUM A <SPORTS_ARENA> or a <TRACT> used for athletic sports with tiered seats or terraces for spectators; a stadium [SOED, "stadium", 3].   1155
STAIR A series of fixed steps leading from one level to another, especially such a series leading from one <FLOOR_LEVEL> to another inside a <STRUCTURE>; a stair [SOED, "stair", A.I.1].   1156
STAIR_SET A <NON_EMPTY_SET> of <STAIR>s connecting three or more <FLOOR_LEVEL>s in an uninterrupted sequence.   1157
STAKE A small <MARKER> used to identify <WATER_CHANNEL>s or to mark dangers (for example: <STONE>s and/or <SHOAL>s); a stake.   1158
STAR A large, coherent, roughly spherical, gaseous <CELESTIAL_BODY> that is luminous by virtue of internal nuclear reactions; a star [SOED, "star", A.I.1].   1159
STATIONARY_FRONT An <ATMOSPHERIC_FRONT> between warm and cold <AIR_MASS>s that is moving at a <<SPEED>> less than 2,575 metres per second (five knots); stationary front.   1160
STEEL_MILL A <FACILITY> for the production of fabricated structural steel products (for example: girders and/or plates); a steel mill.   1161
STEEP_GRADE A stretch along a <LAND_TRANSPORTATION_ROUTE> where the slope is high enough to slow, hinder, or even stop traffic; a steep grade.   1162
STEEPLE A <STRUCTURE>, usually topped by a point, that may be erected on the <ROOF> of a <BUILDING>; a steeple.   1163
STELLAR_BURST_RADIO-
_FREQUENCY_EMISSION
A burst emission from a <STAR> at radio <<WAVELENGTH>>s that often sweep through a range of <<FREQUENCY>>s and last from minutes to days; a stellar burst radio frequency emission.   1164
STELLAR_ENERGETIC_PARTICLE An energetic charged <PARTICLE> emanating from a <STAR>; a stellar energetic particle.
EXAMPLES     Electron, proton, alpha <PARTICLE>.
  1165
STELLAR_FLUX_RADIO_FREQUENCY-
_EMISSION
A continuous (flux) emission from a <STAR> at radio <<WAVELENGTH>>s; a stellar flux radio frequency emission.   1166
STELLAR_WIND A high-speed stream of <STELLAR_ENERGETIC_PARTICLE>s in <SPACE>; a stellar wind.   1167
STONE A piece of <ROCK> of a small or moderate size; stone [SOED, "stone", A.1.a].   1168
STORAGE_BUNKER A <BUNKER> that is used as a <STORAGE_STRUCTURE>; storage bunker.   1169
STORAGE_CONTAINER A <CONTAINER> used for the storage of solid, liquid, or gaseous <MATERIAL>s; a storage container.   1170
STORAGE_DEPOT A <FACILITY> including one or more <STORAGE_STRUCTURE>s; a storage depot.   1171
STORAGE_PIT An excavated <STORAGE_STRUCTURE> that is lined by an impermeable <MATERIAL> and surrounded with <SOIL>; a storage pit.   1172
STORAGE_STRUCTURE A <STRUCTURE> intended for storing <MATERIAL>s or products; a storage structure.   1173
STORAGE_TANK A <CONTAINER> used for the storage of liquids or gases; a storage tank.   1174
STRATOPAUSE The top of the <TEMPERATURE_INVERSION_LAYER>, if it exists, that form the upper limit of the <STRATOSPHERE>; the stratopause.   1175
STRATOSPHERE The <ATMOSPHERE_REGION> of the <EARTH> extending from the <TROPOPAUSE> to the <STRATOPAUSE> in which the <<AIR_TEMPERATURE>> generally increases with <<HEIGHT_AGL>>; the stratosphere.   1176
STREET A <ROAD> in a <BUILT_UP_REGION>; a street.   1177
STREET_LAMP A <LIGHT>, generally located on a <POLE>, that illuminates a <ROAD> or a <SIDEWALK>; street lamp [SOED, "street lamp"].   1178
STRUCTURAL_PILE A <STRUCTURE> consisting of a long, heavy timber or section of steel or concrete that is forced into the <TERRAIN> to serve as a support (for example: for a <PIER>); structural pile.   1179
STRUCTURE A combination of <COMPONENT>s that are fabricated and interconnected in accordance with a design; a structure [APDS, "structure", def. 2].   1180
STRUCTURE_ENTRANCE A way into a <STRUCTURE>; structure entrance.
EXAMPLES     <GATE>, <HALLWAY>, <DOOR>.
  1181
STRUCTURE_ENTRANCE_AND_OR_EXIT A way into, out of, or both into and out of a <STRUCTURE>; structure entrance and/or exit.
EXAMPLES     <GATE>, <HALLWAY>, <DOOR>.
  1182
STRUCTURE_EXIT A way out of a <STRUCTURE>; structure exit [MWCD, "exit", n.3].
EXAMPLES     <GATE>, <HALLWAY>, <DOOR>.
  1183
STRUCTURE_EXTERIOR The <NON_EMPTY_SET> of <EXTERIOR_WALL>s and <ROOF> (if present) of a <STRUCTURE>.   1184
STRUCTURE_PERIMETER The perimeter of a <STRUCTURE>.   1185
STUPA A round, usually dome-shaped, Buddhist <SHRINE> topped with a cupola; a stupa [SOED, "stupa"].   1186
SUBMERGED_ROCK_FORMATION An isolated formation of <ROCK> or a single large <ROCK> that is located in a <WATERBODY> and is typically submerged but possibly projects above the <WATERBODY_SURFACE>.   1187
SUBMERSIBLE_VESSEL A <VESSEL> capable of operation either on a <WATERBODY_SURFACE> or beneath it; a submersible vessel.   1188
SUGAR_CANE A <TRACT> of Saccharum officinarum; sugar cane [AHD, "sugar cane"].   1189
SUN The central <STAR> of the <SOLAR_SYSTEM> containing the <EARTH>; the Sun.   1190
SUNSPOT A relatively cool and dark appearing <REGION> on the photosphere of the <SUN>; a sunspot.   1191
SUPERSTRUCTURE A substantial <STRUCTURE> resting on something else; a superstructure [SOED, "superstructure", 1].   1192
SUPPLIES_AND_EXPENDABLES A <NON_EMPTY_SET> of <EQUIPMENT> and/or <MATERIAL> that may be consumed or discarded after use; supplies and expendables.   1193
SURF The belt of nearly continuous, breaking <WATER_WAVE>s along a <SHORE> or over a submerged bank or <SAND_BAR>; surf.   1194
SURF_ZONE The <REGION> between the outermost limit of <SURF> and the resulting limit of <WATER_WAVE> uprush on a <SHORE>; a surf zone.   1195
SURFACE An outermost, limiting <COMPONENT> of an <OBJECT> that is immediately adjacent to another <OBJECT> (for example: an <ATMOSPHERE> and/or <SPACE>); a surface [SOED, "surface", 1.a].   1196
SURFACE_BASED_EM_DUCT A layer of the <ATMOSPHERE> that is adjacent to the <PLANETARY_SURFACE> of the <EARTH> and in which electromagnetic waves are trapped due to changes in the index of refraction; a surface-based electromagnetic duct.   1197
SURFACE_DATUM A <DATUM> defining a <SURFACE> from which elevations or depths are measured.
EXAMPLES     <VERTICAL_DATUM>, <SOUNDING_DATUM>.
  1198
SURFACE_FISSURE A narrow fissure, crack, and/or rift in the <TERRAIN> or the overlying <SNOW_GROUND_COVER> or <ICE>; a surface fissure.   1199
SURVEILLANCE_WINGED_AIRCRAFT A winged <AIRCRAFT> designed or designated for surveillance missions.   1200
SURVEY_MARKER A <TERRAIN_SURFACE_OBJECT> (for example: a <MARKER>) with a known <LOCATION>; a survey marker.   1201
SWAMP A seasonally flooded, low-lying <WETLAND> with more woody <PLANT>s than a <MARSH> and better drainage than a <BOG>; a swamp [AHD, "swamp", 1a].   1202
SWELL_WAVE A surface gravity <WATER_WAVE> that is not growing or being sustained any longer by the <WIND> but that was generated by the <WIND> some distance away and is now propagating freely across the <WATERBODY_SURFACE> away from its <REGION> of generation; a swell wave.   1203
SWEPT_REGION A <WATERBODY_REGION> that has been determined to be clear of navigational dangers to a specified depth; a swept region.   1204
SWIMMING_POOL A constructed pool used for swimming; a swimming pool [SOED, "swimming pool"].   1205
SYNAGOGUE A <WORSHIP_PLACE> for Jewish worship and religious instruction; a synagogue.   1206
SYSTEM A <NON_EMPTY_SET> of <OBJECT>s arranged or organized for a special purpose and functioning together as a whole; a system [SOED, "system", 3].   1207
SYSTEMATIC_TREE_PLANTING A <TRACT> covered by systematic plantings of <TREE>s that yield a product (for example: a fruit and/or a nut).   1208