The Collaborative International Dictionary of English v.0.48:
kinase \ki"nase\ (k[imac]"n[=a]s), n. (Biochemistry) One of a class of enzymes that catalyze transfer of a phosphate group from ATP to another molecule; it is a type of phosphorylase. [PJC]WordNet (r) 3.0 (2006):
kinase n 1: an enzyme that catalyzes the conversion of a proenzyme to an active enzyme