Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A nonproteinaceous organic substance that usually contains a vitamin or mineral and combines with a specific protein, the apoenzyme, to form an active enzyme system.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any small molecule that is necessary for the functioning of an enzyme.

from the GNU version of the Collaborative International Dictionary of English

  • 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.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a small molecule (not a protein but sometimes a vitamin) essential for the activity of some enzymes

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