<biochemistry> A protein or polypeptide that inhibits ordestroys and enzyme. ... (09 Oct 1997) ... 
Type: Term Pronunciation: an′tē-en′zīm Definitions: 1. An agent or principle that retards, inhibits, or halts the activity of an enzyme; may be an inhibitory enzyme or an antibody to an enzyme (serum antitrypsin).
a substance that inhibits or counteracts the action of an enzyme.