Conoid \Co"noid\ (k[=o]"noid), n. [Gr. kwnoeidh`s conical; kw^nos cone + e'i^dos form: cf. F. cono["i]de.]

1. Anything that has a form resembling that of a cone. [1913 Webster]

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. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

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) . [1913 Webster]

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. [1913 Webster]

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. Ellipsoid

Source: The Collaborative International Dictionary of English v.0.48
 

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

Source: The Collaborative International Dictionary of English v.0.48
 

30 Moby Thesaurus words for "ellipsoid": 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

Source: Moby Thesaurus II by Grady Ward, 1.0
 

ellipsoid adj : in the form of an ellipse [syn: ellipsoidal, spheroidal, non-circular]

noun

a surface whose plane sections are all ellipses or circles; "the Earth is an ellipsoid"

Source: WordNet (r) 2.0
 

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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

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

Source: Webster's Revised Unabridged Dictionary (1913)
 

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.

Source: Webster's Revised Unabridged Dictionary (1913)