/ Dictionary / Index A agglutinin: Meaning and Definition of Find definitions for: ag•glu•ti•nin Pronunciation: (u-glt'n-in), [key] — n. Immunol. an antibody that causes agglutination. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: agglutinin (Thesaurus) agglutinative agglutinogen Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language