R-N==C(R')(R'');a tautomer of an aldimine, formed in many enzyme-catalyze reactions; e.g., aminotransferases. ... (05 Mar 2000) ... 
Type: Term Pronunciation: kē′ta-mēn Definitions: 1. a tautomer of an aldimine, formed in many enzyme-catalyze reactions, aminotransferases.