/ Dictionary / Index A A chromosome: Meaning and Definition of Find definitions for: A chromosome Pronunciation: [key] — Genetics. Genetics. any chromosome belonging to the normal set characteristic of a given species. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. achromobacter Achromycin Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language