agglutinoid
noun
ag·glu·ti·noid
ə-ˈglü-tə-ˌnȯid,
a-
plural -s
: an agglutinin that has lost or never had the power to agglutinate but can still unite with its agglutinogen compare antibody, blocking antibody
Word History
Etymology
International Scientific Vocabulary agglutinin + -oid
First Known Use
1902, in the meaning defined above