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directrix

[ dih-rek-triks, dahy- ]
/ d瑟藞r蓻k tr瑟ks, da瑟- /
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noun, plural di路rec路trix路es, di路rec路tri路ces [dih-rek-tri-seez, dahy-, dahy-rek-trahy-seez]. /d瑟藞r蓻k tr瑟藢siz, da瑟-, 藢da瑟 r蓻k藞tra瑟 siz/.
Geometry. a fixed line used in the description of a curve or surface.
Archaic. a directress.
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Origin of directrix

From New Latin, dating back to 1615鈥25; see origin at direct, -trix

usage note for directrix

See -trix.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, 漏 Random House, Inc. 2021

How to use directrix in a sentence

British Dictionary definitions for directrix

directrix
/ (d瑟藞r蓻ktr瑟ks, da瑟-) /

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 漏 William Collins Sons & Co. Ltd. 1979, 1986 漏 HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for directrix

directrix
[ d沫-r臅ktr沫ks ]

A straight line used in generating a curve such as a parabola.
The American Heritage庐 Science Dictionary Copyright 漏 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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