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directrix

From Wiktionary, the free dictionary

English

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English Wikipedia has an article on:
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Etymology

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From Latin directrix; equivalent to direct +‎ -trix.

Pronunciation

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  • Audio (US):(file)

Noun

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In this picture of an ellipse, a parabola, and an hyperbola, the black line is their shared directrix.

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

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Translations

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Anagrams

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