spheroid ellipsoid

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• 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… …   The Collaborative International Dictionary of English

• Ellipsoid of revolution — 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 …   The Collaborative International Dictionary of English

• Spheroid — Sphe roid, n. [L. spheroides ball like, spherical, Gr. ???; ???? sphere + e i^dos form: cf. F. sph[ e]ro[ i]de.] A body or figure approaching to a sphere, but not perfectly spherical; esp., a solid generated by the revolution of an ellipse about… …   The Collaborative International Dictionary of English

• Ellipsoid — This article is about the shape. For the type of theatrical spotlight, see ellipsoidal reflector spotlight. For the surface that approximates the figure of the Earth, see reference ellipsoid. triaxial redirects here. For the electrical cable, see …   Wikipedia

• ellipsoid — /i lip soyd/, n. 1. Geom. a solid figure all plane sections of which are ellipses or circles. Typical equation: (x2/a2) + (y2/b2) + (z2/c2) = 1. adj. 2. ellipsoidal. [1715 25; < F ellipsoïde. See ELLIPSE, OID] * * * ▪ geometry       closed… …   Universalium

• Spheroid — A spheroid is a quadric surfaceobtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi diameters. If the ellipse is rotated about its major axis, the result is a prolate (elongated)… …   Wikipedia

• ellipsoid of revolution — noun a shape that is generated by rotating an ellipse around one of its axes it looked like a sphere but on closer examination I saw it was really a spheroid • Syn: ↑spheroid • Derivationally related forms: ↑spheroidal (for: ↑spheroid) …   Useful english dictionary

• ellipsoid — Synonyms and related words: 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,… …   Moby Thesaurus

• spheroid —    A three dimensionalform shaped like a sphere but not perfectly round. An egg is typically a spheroid. Commonly a spheroid is an ellipsoid generated by revolving an ellipse around one of its axes. Also see conglobe and ovoid …   Glossary of Art Terms

• spheroid — /sfear oyd/, Geom. n. 1. a solid geometrical figure similar in shape to a sphere, as an ellipsoid. See diag. under prolate. adj. 2. spheroidal. [1655 65; < L sphaeroides < Gk sphairoeidés. See SPHERE, OID] * * * …   Universalium

• spheroid —   Shaped like a sphere but not perfectly round; ellipsoid, e.g. some Cycas seeds and the microsporangia of many cycad species …   Expanded glossary of Cycad terms