bacterioagglutinin

bac·te·ri·o·ag·glu·ti·nin

(bak-tēr'ē-ō-ă-glū'ti-nin),
An antibody that agglutinates bacteria.

bacterioagglutinin

(băk-tē″rē-ō-ă-gloo′tĭ-nĭn) [″ + L. agglutinans, gluing]
An antibody in serum that causes agglutination, or clumping, of bacteria in vitro.