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directrix
[ dih-rek-triks, dahy- ]
/ dɪˈrɛk trɪks, daɪ- /
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noun, plural di·rec·trix·es, di·rec·tri·ces [dih-rek-tri-seez, dahy-, dahy-rek-trahy-seez]. /dɪˈrɛk trɪˌsiz, daɪ-, ˌdaɪ rɛkˈtraɪ siz/.
Geometry. a fixed line used in the description of a curve or surface.
Archaic. a directress.
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usage note for directrix
See -trix.
Words nearby directrix
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use directrix in a sentence
British Dictionary definitions for directrix
directrix
/ (dɪˈrɛktrɪks, daɪ-) /
noun
geometry a fixed reference line, situated on the convex side of a conic section, that is used when defining or calculating its eccentricity
a directress
Word Origin for directrix
C17: New Latin, feminine of director
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
Scientific definitions for directrix
directrix
[ dĭ-rĕk′trĭks ]
A straight line used in generating a curve such as a parabola.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.