From The Collaborative International Dictionary of English v.0.48 [gcide]:
coenzyme \co*en"zyme\ (k[-o]*[e^]n"z[imac]m), (Biochem.) a molecule that is essential for the activity of some enzymes; it may exist free in solution within a living organism, but functions by binding to an enzyme to assist in catalyzing a reaction. The molecule itself may be temporarily changed during the reaction, but is ultimately restored to its original form. Many vitamins function as coenzymes. [PJC]
From WordNet (r) 3.0 (2006) [wn]:
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