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directrices

 - 3 dictionary results

di⋅rec⋅trix

  [di-rek-triks, dahy-]
Use directrices in a Sentence
–noun, plural di⋅rec⋅trix⋅es, di⋅rec⋅tri⋅ces  [di-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.
Origin:
1615–25; < NL; see direct, -trix

Usage note:
See -trix.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To directrices
di·rec·trix   (dĭ-rěk'trĭks, dī-)   


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n.   pl. di·rec·trix·es or di·rec·tri·ces (dī'rěk-trī'sēz)

  1. Mathematics A fixed curve traversed by a generatrix in generating a conic section or a cylinder.

  2. The median line in the trajectory of fire of an artillery piece.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Science Dictionary
directrix   (dĭ-rěk'trĭks)  Pronunciation Key 
A straight line used in generating a curve such as a parabola.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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