Directrix

noun

Definitions

Noun
  1. 1
    A female who directs; a directress.
  2. 2
    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.

Etymology

Learned borrowing from Latin dīrēctrīx. By surface analysis, direct + -trix.

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