/ Dictionary / Index S serodiagnosis: Meaning and Definition of Find definitions for: se•ro•di•ag•no•sis Pronunciation: (sēr"ō-dī"ug-nō'sis), [key] — pl. -ses a diagnosis involving tests on blood serum or other serous fluid of the body. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sero- serology Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language