/ Dictionary / Index C chromaffin: Meaning and Definition of Find definitions for: chro•maf•fin Pronunciation: (krō'mu-fin), [key] — adj. Histol. having an affinity for stains containing chromium salts, indicating the presence of epinephrine or norepinephrine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. chroma chroma key Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language