/ Dictionary / Index A accessory chromosome: Meaning and Definition of Find definitions for: acces'sory chro"mosome Pronunciation: [key] — Genetics. Genetics. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. accessory accessory fruit Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language