/ Dictionary / Index C crux: Meaning and Definition of Find definitions for: crux Pronunciation: (kruks), [key] — pl. crux•es, cru•ces 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. Crux Pronunciation: (kruks), [key] — gen. Cru•cis See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: crux (Thesaurus) crutch Cruz Related Content Daily Word Quiz: alacrity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language