Usually means: Fixed line guiding a parabola.
Definitions Related words Mentions History
We found 22 dictionaries that define the word directrix:

General (16 matching dictionaries)
  1. directrix: Merriam-Webster
  2. directrix: Oxford Learner's Dictionaries
  3. directrix: American Heritage Dictionary of the English Language
  4. directrix: Collins English Dictionary
  5. directrix: Wordnik
  6. directrix: Wiktionary
  7. directrix: Webster's New World College Dictionary, 4th Ed.
  8. directrix: Infoplease Dictionary
  9. directrix: Dictionary.com
  10. Directrix (conic section), Directrix (generatrix), Directrix: Wikipedia, the Free Encyclopedia
  11. Directrix: Online Plain Text English Dictionary
  12. directrix: Webster's Revised Unabridged, 1913 Edition
  13. Directrix: AllWords.com Multi-Lingual Dictionary
  14. directrix: Webster's 1828 Dictionary
  15. directrix: FreeDictionary.org
  16. directrix: TheFreeDictionary.com

Art (1 matching dictionary)
  1. directrix: ArtLex Lexicon of Visual Art Terminology

Computing (1 matching dictionary)
  1. directrix: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Science (3 matching dictionaries)
  1. A Glossary of Mathematical Terms (No longer online)
  2. Directrix: Eric Weisstein's World of Mathematics
  3. directrix, directrix, directrix: PlanetMath Encyclopedia

(Note: See directrices as well.)

Definitions from Wiktionary (directrix)

noun:  A female who directs; a directress.
noun:  (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.

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