英语词汇“directrix”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

　

单词	directrix
释义	directrix di·rec·trix D0245500 (dĭ-rĕk′trĭks, dī-)n. pl. di·rec·trix·es or di·rec·tri·ces (dī′rĕk-trī′sēz) 1. Mathematics A fixed curve traversed by a generatrix in generating a conic section or a cylinder.2. The median line in the trajectory of fire of an artillery piece. directrix (dɪˈrɛktrɪks; daɪ-) n1. (Mathematics) geometry a fixed reference line, situated on the convex side of a conic section, that is used when defining or calculating its eccentricity2. (Professions) a directress[C17: New Latin, feminine of director] di•rec•trix (dɪˈrɛk trɪks, daɪ-) n., pl. di•rec•trix•es, di•rec•tri•ces (dɪˈrɛk trɪˌsiz, daɪ-, ˌdaɪ rɛkˈtraɪ siz) 1. a fixed line used in the description of a curve or surface. 2. Archaic. directress. [1695–1705] usage: See -trix. di·rec·trix (dĭ-rĕk′trĭks) A straight line used in constructing a curve such as a parabola. Directrix directrix [də′rek·triks] (mathematics) A fixed line used in one method of defining a conic; the distance from this line divided by the distance from a fixed point (called the focus) is the same for all points on the conic. A curve through which a line generating a given ruled surface always passes. Directrix in artillery, a specially equipped sector of an artillery range or troop training center: targets are installed, artillery fire positions and observation points are rigged out, and so on. These sectors are designed for artillery fire (artillery directrix), tank fire (tank directrix), antiaircraft artillery fire against ground targets (antiaircraft artillery directrix), and other weapons. Directrix (of a ruled surface), a curve along which a point on a line moves such that the ruled surface is circumscribed by the motion of the line. Any curve intersecting all the generatrices may be taken as the directrix. ThesaurusSeeconic section
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更新时间：2025/3/23 18:13:01