hemagglutinate
[ hee-muh-gloot-n-eyt, hem-uh- ]
/ ˌhi məˈglut nˌeɪt, ˌhɛm ə- /
verb (used with or without object), he·mag·glu·ti·nat·ed, he·mag·glu·ti·nat·ing.
(of red blood cells) to clump.
Origin of hemagglutinate
First recorded in 1920–25;
hem- +
agglutinate