noun, plural cruxes, cruces [kroo-seez] .
a vital, basic, decisive, or pivotal point: The crux of the trial was his whereabouts at the time of the murder.
a cross.
something that torments by its puzzling nature; a perplexing difficulty.

1635–45; < Latin: stake, scaffold, or cross used in executions, torment; figurative senses perhaps < Neo-Latin crux (interpretum) (commentators') torment, a difficult passage in a text; cf. crucial

1. essence, heart, core, gist. Unabridged


[kruhks] .
noun, genitive Crucis [kroo-sis] . Astronomy.

< Latin: a cross Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
crux (krʌks)
n , pl cruxes, cruces
1.  a vital or decisive stage, point, etc (often in the phrase the crux of the matter)
2.  a baffling problem or difficulty
3.  mountaineering the most difficult and often decisive part of a climb or pitch
4.  a rare word for cross
[C18: from Latin: cross]

Crux (krʌks)
n , Latin genitive Crucis
the more formal name for the Southern Cross

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1814, "cross," from L. crux "cross." Figurative use for "a central difficulty," is older, from 1718; perhaps from L. crux interpretum "a point in a text that is impossible to interpret," in which the literal sense is something like "crossroads of interpreters."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

crux (krŭks, kruks)
n. pl. crux·es or cru·ces (krōō'sēz)
A cross or a crosslike structure.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica


constellation lying at about 12 hours 30 minutes right ascension (the coordinate on the celestial sphere analogous to longitude on the Earth) and 60 south declination (angular distance south of the celestial equator), now visible only from south of about 30 north latitude (i.e., the latitude of North Africa and Florida). It appears on the flags of Australia, New Zealand, and Samoa (formerly Western Samoa)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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