Directrix

Directrix
Directrix Di*rect"rix, n.; pl. E. {Directrixes}, L. {Directrices}. 1. A directress. [R.] --Jer. Taylor. [1913 Webster]

2. (Geom.) (a) A line along which a point in another line moves, or which in any way governs the motion of the point and determines the position of the curve generated by it; the line along which the generatrix moves in generating a surface. (b) A straight line so situated with respect to a conic section that the distance of any point of the curve from it has a constant ratio to the distance of the same point from the focus. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Directrix — heißt die Polare eines Brennpunkts eines Kegelschnitts in bezug auf letzteren. Es gibt zwei reelle und zwei imaginäre Directricen. Der Abstand eines Kurvenpunktes vom zugehörigen Brennpunkt ist proportional zu seinem Abstand von der Directrix,… …   Lexikon der gesamten Technik

  • directrix — [də rek′triks; ] also [ dīrek′triks] n. pl. directrixes or directrices [dī΄rek trī′sēz] 1. Rare a woman director 2. Geom. a) a fixed line associated with a conic section and its focus and eccentricity: see PARABOLA b) the curve th …   English World dictionary

  • directrix — noun (plural directrixes; also directrices) Etymology: Medieval Latin, feminine of Late Latin director, from Latin dirigere Date: 1622 1. archaic directress 2. a fixed curve with which a generatrix maintains a give …   New Collegiate Dictionary

  • directrix — /di rek triks, duy /, n., pl. directrixes, directrices /di rek tri seez , duy , duy rek truy seez/. 1. Geom. a fixed line used in the description of a curve or surface. See diag. under parabola. 2. Archaic. a directress. [1615 25; < NL; see… …   Universalium

  • directrix — noun a) A female who directs; a directress. b) A line used to define a curve or surface; especially a line, the distance from which a point on a conic has a constant ratio to that from the focus …   Wiktionary

  • directrix — n. fixed line associated with a parabola or another curve (Geometry); directress di·rec·tor || dɪ rektÉ™ n. manager; stage manager …   English contemporary dictionary

  • directrix —    The fixed curve traversed by a generatrix in generating either a cone or a cylinder. (pr. de rek triks) The plural may be either directrixes or directrices …   Glossary of Art Terms

  • directrix — [dɪ rɛktrɪks, dʌɪ ] noun (plural directrices trɪsi:z) Geometry a fixed line used in describing a curve or surface. Origin C18: from med. L., lit. directress …   English new terms dictionary

  • directrix — di·rec·trix …   English syllables

  • directrix — di•rec•trix [[t]dɪˈrɛk trɪks, daɪ [/t]] n. pl. di•rec•trix•es, di•rec•tri•ces [[t]dɪˈrɛk trɪˌsiz, daɪ , ˌdaɪ rɛkˈtraɪ siz[/t]] 1) math. a fixed line used in the description of a curve or surface 2) use archaic directress • Etymology: 1695–1705… …   From formal English to slang

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