/ Dictionary / Index S serositis: Meaning and Definition of Find definitions for: se•ro•si•tis Pronunciation: (sēr"ō-sī'tis, -zī'-), [key] — n. Pathol. inflammation of a serous membrane. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. serosa serotherapy Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language