/ Dictionary / Index T thrombus: Meaning and Definition of Find definitions for: throm•bus Pronunciation: (throm'bus), [key] — pl. -bi a fibrinous clot that forms in and obstructs a blood vessel, or that forms in one of the chambers of the heart. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thrombus (Thesaurus) thromboxane throne Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language