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.
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