paraboloid of revolution

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• paraboloid of revolution — the surface generated by the rotation of a parabola about its axis it is a property of a paraboloid of revolution … that rays from an object at infinity are all imaged at the same point on the axis F.W.Sears * * * paraboloid of revolution, =… …   Useful english dictionary

• Paraboloid — of revolution In mathematics, a paraboloid is a quadric surface of special kind. There are two kinds of paraboloids: elliptic and hyperbolic. The elliptic paraboloid is shaped like an oval cup and can have a maximum or minimum point. In a… …   Wikipedia

• paraboloid — [pə rab′əloid΄] n. a surface or solid formed so that sections parallel to the plane of symmetry are parabolas and sections perpendicular to it are ellipses (elliptic paraboloid), hyperbolas (hyperbolic paraboloid), or circles (paraboloid of… …   English World dictionary

• paraboloid — paraboloidal /peuh rab euh loyd l, par euh beuh /, adj. /peuh rab euh loyd /, n. Geom. a surface that can be put into a position such that its sections parallel to at least one coordinate plane are parabolas. Cf. elliptic paraboloid, hyperbolic… …   Universalium

• paraboloid — n. 1 (in full paraboloid of revolution) a solid generated by the rotation of a parabola about its axis of symmetry. 2 a solid having two or more non parallel parabolic cross sections. Derivatives: paraboloidal adj …   Useful english dictionary

• paraboloid — 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… …   The Collaborative International Dictionary of English

• paraboloid — noun A surface having a parabolic cross section parallel to an axis, and circular or elliptical cross section perpendicular to the axis; especially the surface of revolution of a parabola …   Wiktionary

• paraboloid — /pəˈræbəlɔɪd/ (say puh rabuhloyd) noun a solid or surface generated by the revolution of a parabola about its axis, or one of the second degree some of whose plane sections are parabolas. –paraboloidal /pəræbəˈlɔɪdl/ (say puhrabuh loydl),… …  

• mathematics — /math euh mat iks/, n. 1. (used with a sing. v.) the systematic treatment of magnitude, relationships between figures and forms, and relations between quantities expressed symbolically. 2. (used with a sing. or pl. v.) mathematical procedures,… …   Universalium

• Pfund telescope — The Pfund telescope, originated by A. H. Pfund, provides another method for achieving a fixed telescope focal point in space regardless of where the telescope line of sight is pointed. This configuration utilizes a two axis feed flat mirror to… …   Wikipedia

• Parabola — For other uses, see Parabola (disambiguation). A parabola …   Wikipedia