Crucis

Crucis

[kroo-sis]
noun Astronomy.
genitive of Crux.

Origin:
< Latin

Dictionary.com Unabridged

Crux

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

Origin:
< Latin: a cross

Dictionary.com 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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Etymonline
Word Origin & History

crux
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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