flavin

1. Any of various water-soluble yellow pigments, including riboflavin, found in plant and animal tissue as coenzymes of flavoprotein.
2. A ketone, C₁₀H₆N₄O₂, that gives color to various natural yellow pigments.

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1. Any of various water-soluble yellow pigments, including riboflavin, found in plant and animal tissue as coenzymes of flavoproteins.
2. A ketone that gives color to various natural yellow pigments.

Any of a group of water-soluble yellow pigments widely distributed in animals and plants, including riboflavin and yellow enzymes.

• f. adenine dinucleotide (FAD) — a coenzyme that is a condensation product of riboflavin phosphate and adenylic acid; it forms the prosthetic group of certain enzymes, including d-amino acid oxidase and xanthine oxidase, and is important in electron transport in mitochondria.
• f.-linked dehydrogenases — class of dehydrogenases with prosthetic groups containing either flavin mononucleotide or flavin adenine dinucleotide tightly bound to the enzyme structure. Example is succinate dehydrogenase of the TCA cycle.
• f. 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.

The noun has one meaning:

Meaning #1: a ketone that forms the nucleus of certain natural yellow pigments like riboflavin