Breadcrumb Home > Dictionary > Index P platelet: Meaning and Definition of Find definitions for: plate•let Pronunciation: (plāt'lit), [key] — n. Cell Biol. a small platelike body, esp. a blood platelet. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: platelet (Thesaurus) plateholder platemaker ✖ Related Content Daily Word Quiz: sophism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language