/ Dictionary / Index A Acrux: Meaning and Definition of Find definitions for: A•crux Pronunciation: (ā'kruks), [key] — n. Astron. a star of the first magnitude in the constellation Southern Cross. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acrotism acrylaldehyde Related Content Daily Word Quiz: wary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language