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directrix

[ dih-rek-triks, dahy- ]

noun

, plural di·rec·trix·es, di·rec·tri·ces [dih-, rek, -tri-seez, dahy-, dahy-rek-, trahy, -seez].
  1. Geometry. a fixed line used in the description of a curve or surface.
  2. Archaic. a directress.


directrix

/ daɪ-; dɪˈrɛktrɪks /

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
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


directrix

/ dĭ-rĕktrĭks /

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


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Gender Note

See -trix.
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Word History and Origins

Origin of directrix1

From New Latin, dating back to 1615–25; direct, -trix
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Word History and Origins

Origin of directrix1

C17: New Latin, feminine of director
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Example Sentences

The surface formed by revolving the catenary about its directrix is named the alysseide.

Since the tension is measured by the height above the directrix these two catenaries have the same directrix.

The only surface of revolution having this property is the catenoid formed by the revolution of a catenary about its directrix.

Hence T, the point of intersection of Pp and Qq, must be the centre of similitude and must be on the common directrix.

If the directrix, focus and eccentricity be given, we may employ the general method for constructing a conic.

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