/ Dictionary / Index T tonsillitis: Meaning and Definition of Find definitions for: ton•sil•li•tis Pronunciation: (ton"su-lī'tis), [key] — n. Pathol. inflammation of a tonsil or the tonsils. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tonsillitis (Thesaurus) tonsillectomy tonsillotomy Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language