/ Dictionary / Index N N terminus: Meaning and Definition of Find definitions for: N terminus Pronunciation: (en'tûr"mu-nl), [key] — Biochem. Biochem. the amino end of a protein molecule. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. -n't nth Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language