/ Dictionary / Index S serotype: Meaning and Definition of Find definitions for: se•ro•type Pronunciation: (sēr'u-tīp", ser'-), [key] — n., v., -typed, -typ•ing. —n. a group of organisms, microorganisms, or cells distinguished by their shared specific antigens as determined by serologic testing. the set of antigens that characterizes the group. —v.t. to classify by serotype. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. serotonin serous Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language