/ Dictionary / Index P polypeptide: Meaning and Definition of Find definitions for: pol•y•pep•tide Pronunciation: (pol"ē-pep'tīd, -tid), [key] — n. Biochem. a chain of amino acids linked together by peptide bonds and having a molecular weight of up to about 10,000. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: polypeptide (Thesaurus) polyped polypetalous Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language