Main Entry:

crux

Pronunciation:

\ˈkrəks, ˈkru̇ks\

Function:

noun

Inflected Form(s):

plural crux·es also cru·ces \ˈkrü-ˌsēz\

Etymology:

Latin cruc-, crux cross, torture

Date:

1718

1 : a puzzling or difficult problem : an unsolved question 2 : an essential point requiring resolution or resolving an outcome <the crux of the problem> 3 : a main or central feature (as of an argument)