directrix

[ dih-rek-triks, dahy- ]

/ dɪˈrɛk trɪks, daɪ- /

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.

Origin of directrix

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

usage note for directrix

See -trix.

Words nearby directrix

direct product, direct question, direct reacting bilirubin, direct-reading, directress, directrix, direct selling, direct speech, direct sum, direct tax, direct transfusion

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for directrix

The surface formed by revolving the catenary about its directrix is named the alysseide.
Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5|Various
If a parabola roll on another parabola, their vertices coinciding, the focus of the first traces out the directrix of the second.
The Romance of Mathematics|P. Hampson
The centre of a circle is its focus, and its directrix has gone to infinity, having no special direction.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6|Various
Similarly, in an hyperbola a vertex is nearer 704 to the directrix than to the focus.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6|Various

If the directrix, focus and eccentricity be given, we may employ the general method for constructing a conic.
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3|Various

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.

单词	directrix
释义	directrix [ dih-rek-triks, dahy- ] / dɪˈrɛk trɪks, daɪ- / 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. Origin of directrix From New Latin, dating back to 1615–25; see origin at direct, -trix usage note for directrix See -trix. Words nearby directrix direct product, direct question, direct reacting bilirubin, direct-reading, directress, directrix, direct selling, direct speech, direct sum, direct tax, direct transfusion Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for directrix The surface formed by revolving the catenary about its directrix is named the alysseide. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 5\|Various If a parabola roll on another parabola, their vertices coinciding, the focus of the first traces out the directrix of the second. The Romance of Mathematics\|P. Hampson The centre of a circle is its focus, and its directrix has gone to infinity, having no special direction. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6\|Various Similarly, in an hyperbola a vertex is nearer 704 to the directrix than to the focus. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6\|Various If the directrix, focus and eccentricity be given, we may employ the general method for constructing a conic. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3\|Various 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.
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