directrix


noun, plural di·rec·trix·es, di·rec·tri·ces [dih-rek-tri-seez, dahy-, dahy-rek-trahy-seez] /dɪˈrɛk trɪˌsiz, daɪ-, ˌdaɪ rɛkˈtraɪ siz/.

  1. Geometry. a fixed line used in the description of a curve or surface.
  2. Archaic. a directress.

noun

  1. geometry a fixed reference line, situated on the convex side of a conic section, that is used when defining or calculating its eccentricity
  2. a directress

  1. A straight line used in generating a curve such as a parabola.

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