directrix

[dih-rek-triks, dahy-]

di·rec·trix

[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.

Origin:
1615–25; < Neo-Latin; see direct, -trix


See -trix.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Directrix is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
the offspring of a zebra and a donkey.
Collins
World English Dictionary
directrix (dɪˈrɛktrɪks, daɪ-)
 
n
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
 
[C17: New Latin, feminine of director]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
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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