/ Dictionary / Index C C terminus: Meaning and Definition of Find definitions for: C terminus Pronunciation: (sē'tûr"mu-nl), [key] — Biochem. Biochem. the carboxyl end of a protein molecule. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ctenophore Ctesiphon Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language