/ Dictionary / Index S serous: Meaning and Definition of Find definitions for: se•rous Pronunciation: (sēr'us), [key] — adj. resembling serum; of a watery nature. containing or secreting serum. of, pertaining to, or characterized by serum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: serous (Thesaurus) serotype serous fluid Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language