directrix

English

Etymology

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

Pronunciation

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Noun

directrix (plural directrixes or directrices)

  1. A female who directs; a directress.
  2. (geometry) 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.

Derived terms

  • conic section directrix
  • graph directrix
  • ruled surface directrix

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