/ Dictionary / Index M mastitis: Meaning and Definition of Find definitions for: mas•ti•tis Pronunciation: (ma-stī'tis), [key] — n. inflammation of the breast. inflammation of the udder, esp. of cows; garget. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mastitis (Thesaurus) masting masto- Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language