Type: Term Pronunciation: ad-hē′zins Definitions: 1. Microbial surface antigens that frequently exist in the form of filamentous projections (pili or fimbriae) and bind to specific receptors on epithelial cell membranes; usually classified according to their ability to induce agglutination of erythrocytes from various species, their diff... Found on http://www.medilexicon.com/medicaldictionary.php?t=1269