There are 2 main definitions of crux in English:

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crux 1

Syllabification: crux
Pronunciation: /krəks/

noun (plural cruxes or crucesˈkro͞oˌsēz)

(the crux)
1The decisive or most important point at issue: the crux of the matter is that attitudes have changed
More example sentences
  • This trend may continue and therein lies the crux of the issue.
  • And this is the crux of the issue, the reality which is so often unmentioned.
  • This gets at the crux of the issue I am raising, and I want to fundamentally disagree.
nub, heart, essence, central point, main point, core, center, nucleus, kernel
informal bottom line
1.1A particular point of difficulty: both cruces can be resolved by a consideration of the manuscripts
More example sentences
  • One of the cruxes of the problems is that the funding is based on race and location, not on individual patient need.
  • Royal Shakespeare Company audiences, like the company, tended to be knowledgeable about the texts, anticipating how a production might handle the cruxes.
  • This was probably the first play the Folio's compositors set from such copy, which may help to explain its high percentage of misprints, errors, and cruces.


Mid 17th century (denoting a representation of a cross, chiefly in crux ansata 'ankh', literally 'cross with a handle'): from Latin, literally 'cross'.

  • excruciating from late 16th century:

    The source of excruciate is Latin excruciare ‘to torment or torture’, which was based on crux. This meant ‘a cross’, of the kind used to crucify someone, and is the root not only of cross but also of crucial, and crux (mid 17th century). In English to excruciate someone was originally to torture them.

Words that rhyme with crux

dux, flux, lux, luxe, tux
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There are 2 main definitions of crux in English:

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Crux 2 Syllabification: Crux
1 another term for the Southern Cross.
1.1 (as genitive Crucisˈkro͞osis) Used with a preceding letter or numeral to designate a star in this constellation: the star Beta Crucis



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