/ Dictionary / Index T thrombocytopenia: Meaning and Definition of Find definitions for: throm•bo•cy•to•pe•ni•a Pronunciation: (throm"bō-sī"tu-pē'nē-u), [key] — n. an abnormal decrease in the number of blood platelets. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thrombocytopenia (Thesaurus) thrombocyte thromboembolism Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language