/ Dictionary / Index P polychaete: Meaning and Definition of Find definitions for: pol•y•chaete Pronunciation: (pol'i-kēt"), [key] — n. any annelid of the class Polychaeta, having unsegmented swimming appendages with many setae or bristles. —adj. belonging or pertaining to the Polychaeta. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: polychaete (Thesaurus) polycentrism polychasium Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language