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	Eng ID	Term	Definition
	4941	sphere	A curved surface all points of which are equidistant from a fixed point within, called the centre.
	4942	spherical aberration	See ABERRATION OF LIGHT.
	4943	spherical buoy	See BUOY.
	4944	spherical coordinates	See COORDINATES.
	4945	spherical excess	The amount by which the sum of the three angles of a spherical triangle exceeds 180°.
	4946	spherical sailing	See SAILING.
	4947	spherical wave	See WAVE.
	4948	spheroid	An ellipsoid; a figure resembling a sphere. Also called ellipsoid or ELLIPSOID OF REVOLUTION, from the fact that it can be formed by revolvi... more An ellipsoid; a figure resembling a sphere. Also called ellipsoid or ELLIPSOID OF REVOLUTION, from the fact that it can be formed by revolving an ellipse about one of its axes. In GEODESY, this term is frequently used to mean REFERENCE SPHEROID. See also SPHEROID: OBLATE and SPHEROID: PROLATE.
	4949	spheroid: oblate	An ELLIPSOID OF REVOLUTION, the minor AXIS of which is the AXIS of REVOLUTION. The EARTH is approximately an oblate spheroid.
	4950	spheroid: prolate	An ELLIPSOID OF REVOLUTION, the major AXIS of which is the AXIS of REVOLUTION.
	4951	spheroid of reference	See REFERENCE SPHEROID.
	4952	spicule	A minute needlelike or multiradiate calcareous or siliceous body in sponges, radiolarians, primitive chitons, and echinoderms. They freque... more A minute needlelike or multiradiate calcareous or siliceous body in sponges, radiolarians, primitive chitons, and echinoderms. They frequently are identified in marine sediment samples.
	4953	spilling breaker	See BREAKER.
	4954	spindle	A spar serving as a BEACON. A slender pin or rod, as one constituting part of a machine.
	4955	spire	A pointed structure extending above a building. The spire is seldom less than two‑thirds of the entire height and its lines are rarely bro... more A pointed structure extending above a building. The spire is seldom less than two‑thirds of the entire height and its lines are rarely broken by stages or other features. The term is not applied to short pyramid-shaped structures rising from a tower or belfry.
	4956	spirit bubble	See LEVEL: SPIRIT.
	4957	spirit compass	See COMPASS: LIQUID.
	4958	spirit level	See LEVEL.
	4959	spirit level axis	See AXIS OF SPIRIT LEVEL.
	4960	spirit levelling	See LEVELLING.
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