sub·til·i·sin 
(sŭb-tĭlĭ-sĭn)
(sŭb-tĭlĭ-sĭn)n.
Any of several extracellular enzymes produced by bacteria of the genus Bacillus that catalyze the breakdown of proteins into polypeptides and are widely used in detergents and cleaning products.
[New Latin (Bacillus) subtīlis, bacterial species to which were assigned the bacteria from which a subitilisin was first isolated (now known to be B. amyloliquefaciens); see SUBTILIN + -IN.]