kinase

n. any of a number of enzymes which catalyze the transfer of a phosphate group from a donor to an acceptor (Biochemistry)

In chemistry and biochemistry, a kinase, alternatively known as a phosphotransferase, is a type of enzyme that transfers phosphate groups from high-energy donor molecules, such as ATP, to specific target molecules (substrates); the process is termed phosphorylation (An enzyme that removes phosphate groups from targets is known as a phosphatase.)
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Kinase /ki·nase/ 1. a subclass of the transferases, comprising the enzymes that catalyze the transfer of a high-energy group from a donor to an [more]Kinase - Community and Resources

Noun
1. an enzyme that catalyzes the conversion of a proenzyme to an active enzyme
(hypernym) enzyme

n. kinase, chemical substance