There are 2 definitions of crux in English:

crux1

Line breaks: crux
Pronunciation: /krʌks
 
/

noun (plural cruxes or cruces /ˈkruːsiːz/)

(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.
Synonyms
nub, heart, essence, most important point, central point, main point, essential part, core, centre, nucleus, kernel
informal the 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.

Origin

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

Definition of crux in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal

There are 2 definitions of crux in English:

Crux2

Line breaks: Crux
Pronunciation: /krʌks
 
/
Astronomy
1The smallest constellation (the Cross or Southern Cross), but the most familiar one to observers in the southern hemisphere. It contains the bright star Acrux, the ‘Jewel Box’ star cluster, and most of the Coalsack nebula. Formerly called Crux Australis.
1.1 (as genitive Crucis /ˈkruːsɪs/) Used with preceding letter or numeral to designate a star in this constellation: the star Beta Crucis

Origin

Latin.

Definition of crux in: