Adjacent Words

Ellipsoid definitions

	Tweet

Webster's 1828 Dictionary

ELLIPS'OID, n. [ellipsis and Gr. form.] In conics, a solid or figure formed by the revolution of an ellipse about its axis; an elliptic conoid; a spheroid.

WordNet (r) 3.0 (2005)

adj
1: having the nature or shape of an ellipsoid [syn: ellipsoid, ellipsoidal, spheroidal] n
1: a surface whose plane sections are all ellipses or circles; "the Earth is an ellipsoid"

Merriam Webster's

noun Date: 1721 a surface all plane sections of which are ellipses or circles • ellipsoidal also ellipsoid adjective

Oxford Reference Dictionary

n. a solid of which all the plane sections normal to one axis are circles and all the other plane sections are ellipses. Derivatives: ellipsoidal adj.

Webster's 1913 Dictionary

Ellipsoid El*lip"soid, n. [Ellipse + -oid: cf. F. ellipsoide.] (Geom.) A solid, all plane sections of which are ellipses or circles. See Conoid, n., 2 (a) . Note: The ellipsoid has three principal plane sections, a, b, and c, each at right angles to the other two, and each dividing the solid into two equal and symmetrical parts. The lines of meeting of these principal sections are the axes, or principal diameters of the ellipsoid. The point where the three planes meet is the center. Ellipsoid of revolution, a spheroid; a solid figure generated by the revolution of an ellipse about one of its axes. It is called a prolate spheroid, or prolatum, when the ellipse is revolved about the major axis, and an oblate spheroid, or oblatum, when it is revolved about the minor axis.

Webster's 1913 Dictionary

Ellipsoid El*lip"soid, Ellipsoidal El`lip*soi"dal, a. Pertaining to, or shaped like, an ellipsoid; as, ellipsoid or ellipsoidal form.

Webster's 1913 Dictionary

Conoid Co"noid, n. [Gr. ? conical; ? cone + ? from: cf. F. cono["i]de.] 1. Anything that has a form resembling that of a cone. 2. (Geom.) (a) A solid formed by the revolution of a conic section about its axis; as, a parabolic conoid, elliptic conoid, etc.; -- more commonly called paraboloid, ellipsoid, etc. (b) A surface which may be generated by a straight line moving in such a manner as always to meet a given straight line and a given curve, and continue parallel to a given plane. --Math. Dict.

Moby Thesaurus

ball, balloon, bladder, blob, boll, bolus, bubble, bulb, bulbil, bulblet, geoid, globe, globelet, globoid, globule, glomerulus, gob, gobbet, knob, knot, oblate spheroid, orb, orbit, orblet, pellet, prolate spheroid, rondure, sphere, spheroid, spherule