agglutinin
noun
ag·glu·ti·nin ə-ˈglü-tə-nən 
: a substance (such as an antibody) producing agglutination
Word History
Etymology
borrowed from German Agglutinine, from agglutinirin (now agglutinieren) "to agglutinate entry 1" + -ine -ine entry 2
First Known Use
1896, in the meaning defined above
Medical Definition
agglutinin
noun
ag·glu·ti·nin ə-ˈglüt-ᵊn-ən
: a substance (as an antibody) producing agglutination