hemagglutination Syllabification: (he·mag·glu·ti·na·tion)Pronunciation: /ˌhēməˌglo͞otnˈāSHən/ (British haemagglutination)Definition of hemagglutination noun Medicine & Biology the clumping together of red blood cells. Derivatives hemagglutinatePronunciation: /-ˈglo͞otnˌāt/ verb hemagglutination in other Oxford dictionaries Definition of hemagglutination in the British & World English dictionary