/ Dictionary / Index T tumulus: Meaning and Definition of Find definitions for: tu•mu•lus Pronunciation: (t'myu-lus, ty'-), [key] — pl. -lus•es, -li an artificial mound, esp. over a grave; barrow. a domelike swelling or mound formed in congealed lava. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tumulus (Thesaurus) tumultuous tun Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language