/ Dictionary / Index B B chromosome: Meaning and Definition of Find definitions for: B chromosome Pronunciation: [key] — Genetics. Genetics. a type of densely staining chromosome of uncertain biological function, found in many plant and animal species. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. B.Ch.E. B.C.L. Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language