/ Dictionary / Index H hemagglutinate: Meaning and Definition of Find definitions for: he•mag•glu•ti•nate Pronunciation: (hē"mu-glt'n-āt", hem"u-), [key] — -nat•ed, -nat•ing. (of red blood cells) to clump. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hemagglutinate (Thesaurus) hemacytometer hemagglutination Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language