/ Dictionary / Index S sex chromosome: Meaning and Definition of Find definitions for: sex' chro"mosome Pronunciation: [key] — Genetics. Genetics. a chromosome, differing in shape or function from other chromosomes, that determines the sex of an individual. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sex chromatin sexdecillion Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language