/ Dictionary / Index T thelitis: Meaning and Definition of Find definitions for: the•li•tis Pronunciation: (thi-lī'tis), [key] — n. Pathol. inflammation of the nipple. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Theiss Thelma Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language