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	Eng ID	Term	Definition
	4961	spit	A small point of land or narrow SHOAL projecting into a body of water from the SHORE.
	4962	splines	Flexible rulers or interpolation algorithm used to draw smooth curves between points when constructing e.g. hyperbolic lattices.
	4963	split fix	See FIX.
	4964	split line of sounding	A LINE OF SOUNDING run to fill a void when the maximum spacing of principal lines is exceeded.
	4965	spoil	MUD, SAND, SILT or other DEPOSIT obtained from the BOTTOM of a CHANNEL or HARBOUR by dredging.
	4966	spoil banks	Submerged accumulations of dumped material dredged from CHANNELS or HARBOURS.
	4967	spoil ground	A sea area where dredged material is deposited. See also DUMPING GROUND.
	4968	spoil ground buoy	A BUOY marking the limit of a SPOIL GROUND.
	4969	spot elevation	A point on a MAP or CHART whose ELEVATION is noted. It is usually indicated by a dot accompanied by a number indicating the vertical distan... more A point on a MAP or CHART whose ELEVATION is noted. It is usually indicated by a dot accompanied by a number indicating the vertical distance of the point from the reference DATUM. Spot elevations are used principally to indicate points higher than their surroundings. Also calledspot height.
	4970	spot height	See SPOT ELEVATION.
	4971	spout	Phenomenon consisting of an often violent WHIRLWIND, revealed by the presence of a cloud column or inverted cloud cone (funnel cloud), prot... more Phenomenon consisting of an often violent WHIRLWIND, revealed by the presence of a cloud column or inverted cloud cone (funnel cloud), protruding from the base of a cumulonimbus and of a 'bush' composed of water drops raised from the surface of the SEA or of DUST, SAND, or litter, raised from the GROUND.
	4972	spray	Ensemble of water droplets torn by the WIND from the surface of an extensive body of water, generally from the CRESTS of WAVES, and carried... more Ensemble of water droplets torn by the WIND from the surface of an extensive body of water, generally from the CRESTS of WAVES, and carried up a short distance into the air.
	4973	spring	SPRING TIDE. A natural issue of water or other substances from the EARTH. One on the BOTTOM of the SEA is called a submarine spring.
	4974	spring high water	See MEAN HIGH WATER SPRINGS.
	4975	spring low water	See MEAN LOW WATER SPRINGS.
	4976	spring range	The mean semidiurnal RANGE OF TIDE when SPRING TIDES are occurring. The mean difference in HEIGHT between MEAN HIGH WATER SPRINGS and MEAN ... more The mean semidiurnal RANGE OF TIDE when SPRING TIDES are occurring. The mean difference in HEIGHT between MEAN HIGH WATER SPRINGS and MEAN LOW WATER SPRINGS. Also called mean spring range.
	4977	spring rise	See MEAN SPRING RISE.
	4978	spring tide(s)	See TIDE.
	4979	spur	A subordinate ELEVATION, RIDGE or RISE projecting outward from a larger feature.
	4980	squall	Atmospheric phenomenon characterized by a very large variation of wind speed: it begins suddenly, has a duration of the order of minutes, a... more Atmospheric phenomenon characterized by a very large variation of wind speed: it begins suddenly, has a duration of the order of minutes, and decreases rather suddenly in SPEED. It is often accompanied by a SHOWER or THUNDERSTORM.
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