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单词 directrix
释义

directrix

/dɪˈrɛktrɪks / /dʌɪˈrɛktrɪks/
noun (plural directrices /dɪˈrɛktrɪsiːz/ /dʌɪˈrɛktrɪsiːz/) Geometry
A fixed line used in describing a curve or surface.In the following, the feet of perpendiculars dropped from points A, B, etc. on the parabola to the directrix will be denoted A ’, B ’, etc....
  • The focus and directrix of a hyperbola were considered by Pappus.
  • The directrix is used in the construction, which follows, mutatis mutandis, the same course as the above construction in the case of the ellipse.

Origin

Early 18th century: from medieval Latin, literally 'directress', based on Latin dirigere 'to guide'.

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更新时间:2025/1/12 6:54:50