Parabolic mirror
Parabolic Par`a*bol"ic, Parabolical Par`a*bol"ic*al, a. [Gr. paraboliko`s figurative: cf. F. parabolique. See {Parable}.] [1913 Webster] 1. Of the nature of a parable; expressed by a parable or figure; allegorical; as, parabolical instruction. [1913 Webster]

2. [From {Parabola}.] (Geom.) (a) Having the form or nature of a parabola; pertaining to, or resembling, a parabola; as, a parabolic curve. (b) Having a form like that generated by the revolution of a parabola, or by a line that moves on a parabola as a directing curve; as, a parabolic conoid; a parabolic reflector; a parabolic antenna. [1913 Webster +PJC]

{Parabolic conoid}, a paraboloid; a conoid whose directing curve is a parabola. See {Conoid}.

{Parabolic mirror} (Opt.), a mirror having a paraboloidal surface which gives for parallel rays (as those from very distant objects) images free from aberration. It is used in reflecting telescopes.

{Parabolic spindle}, the solid generated by revolving the portion of a parabola cut off by a line drawn at right angles to the axis of the curve, about that line as an axis.

{Parabolic spiral}, a spiral curve conceived to be formed by the periphery of a semiparabola when its axis is wrapped about a circle; also, any other spiral curve having an analogy to the parabola. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • parabolic mirror — noun a parabolic reflector for light radiation • Hypernyms: ↑parabolic reflector, ↑paraboloid reflector • Part Holonyms: ↑reflecting telescope, ↑reflector * * * noun see parabolic reflector 1 * * …   Useful english dictionary

  • parabolic mirror — paraboliškasis veidrodis statusas T sritis radioelektronika atitikmenys: angl. parabolic mirror vok. Parabolspiegel, m rus. параболическое зеркало, n pranc. miroir parabolique, m …   Radioelektronikos terminų žodynas

  • parabolic mirror — parabolinis veidrodis statusas T sritis fizika atitikmenys: angl. parabolic mirror vok. Parabolspiegel, m rus. параболическое зеркало, n pranc. miroir parabolique, m …   Fizikos terminų žodynas

  • Parabolic — Par a*bol ic, Parabolical Par a*bol ic*al, a. [Gr. paraboliko s figurative: cf. F. parabolique. See {Parable}.] [1913 Webster] 1. Of the nature of a parable; expressed by a parable or figure; allegorical; as, parabolical instruction. [1913… …   The Collaborative International Dictionary of English

  • Parabolic conoid — Parabolic Par a*bol ic, Parabolical Par a*bol ic*al, a. [Gr. paraboliko s figurative: cf. F. parabolique. See {Parable}.] [1913 Webster] 1. Of the nature of a parable; expressed by a parable or figure; allegorical; as, parabolical instruction.… …   The Collaborative International Dictionary of English

  • Parabolic spindle — Parabolic Par a*bol ic, Parabolical Par a*bol ic*al, a. [Gr. paraboliko s figurative: cf. F. parabolique. See {Parable}.] [1913 Webster] 1. Of the nature of a parable; expressed by a parable or figure; allegorical; as, parabolical instruction.… …   The Collaborative International Dictionary of English

  • Parabolic spiral — Parabolic Par a*bol ic, Parabolical Par a*bol ic*al, a. [Gr. paraboliko s figurative: cf. F. parabolique. See {Parable}.] [1913 Webster] 1. Of the nature of a parable; expressed by a parable or figure; allegorical; as, parabolical instruction.… …   The Collaborative International Dictionary of English

  • Parabolic reflector — Parallel waves coming in to a parabolic mirror are focused at a point F A parabolic reflector (or dish or mirror) is a reflective device used to collect or project energy such as light, sound, or radio waves. Its shape is that of a circular… …   Wikipedia

  • parabolic reflector — noun a concave reflector used to produce a parallel beam when the source is placed at its focus or to focus an incoming parallel beam • Syn: ↑paraboloid reflector • Hypernyms: ↑reflector • Hyponyms: ↑parabolic mirror * * * noun …   Useful english dictionary

  • Parabolic antenna — A parabolic satellite communications antenna at Erdfunkstelle Raisting, the biggest facility for satellite communication in the world, in Raisting, Bavaria, Germany. It has a Cassegrain type feed. A parabolic antenna is an antenna that uses a… …   Wikipedia

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