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any of a group of water-soluble yellow pigments widely distributed in animals and plants, including riboflavin and yellow enzymes.
flavin adenine dinucleotide (FAD) a coenzyme that is a condensation product of riboflavin phosphate and adenylic acid; it forms the prosthetic group (non–amino acid component) of certain enzymes, including d-amino acid oxidase and xanthine oxidase, and is important in electron transport in mitochondria.
flavin mononucleotide (FMN) a derivative of riboflavin consisting of a three-ring system (isoalloxazine) attached to an alcohol (ribitol); it acts as a coenzyme for a number of oxidative enzymes, including l-amino acid oxidase and cytochrome C reductase.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


, flavine (flā'vin, -vēn, flav'in, -ēn),
1. Synonym(s): riboflavin
2. A yellow acridine dye, preparations of which are used as antiseptics.
[L. flavus, yellow]
Farlex Partner Medical Dictionary © Farlex 2012


(flā′vĭn) also


Any of various molecules, including riboflavin, found in plant and animal tissue as coenzymes of flavoproteins. They are variously yellow, red, blue, or colorless depending on the oxidation state.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


A heat-stable factor of the vitamin B complex with isoalloxazine nucleotides that are coenzymes of the flavohydrogenases.
Synonym(s): flavin, flavine, riboflavine.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


One of a range of water soluble yellow pigments that includes the vitamin RIBOFLAVIN. Flavins occur in the tissues as coenzymes of FLAVOPROTEINS.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005