directrix line

См. также в других словарях:

• 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… …   The Collaborative International Dictionary of English

• 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 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 — 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 — 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 — [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 [[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

• directrix — /dəˈrɛktrɪks/ (say duh rektriks) noun (plural directrices /dəˈrɛktrəsiz/ (say duh rektruhseez)) 1. Mathematics a fixed line used in the description of certain curves or surfaces. 2. a directress. {New Latin} …  

• directrix — n. (pl. directrices) Geom. a fixed line used in describing a curve or surface. Etymology: med.L f. LL director: see DIRECTOR, TRIX …   Useful english dictionary

• direct line — Synonyms and related words: affiliation, air line, apparentation, axis, beeline, birth, blood, bloodline, branch, breed, chord, common ancestry, consanguinity, derivation, descent, diagonal, diameter, directrix, distaff side, edge, extraction,… …   Moby Thesaurus