/ Dictionary / Index A antiserum: Meaning and Definition of Find definitions for: an•ti•se•rum Pronunciation: (an'tu-sēr"um), [key] — pl. -se•rums, -se•ra a serum containing antibodies, as antitoxins or agglutinins, obtained by inoculation of animals and used for injection into other animals to provide immunity to a specific disease. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: antiserum (Thesaurus) antisepticize antisexist Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language