/flay"vin/, n. Biochem.
1. a complex heterocyclic ketone that is common to the nonprotein part of several important yellow enzymes, the flavoproteins.
2. quercetin.
Also, flavine.
[1850-55; FLAV- + -IN2]

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Any of a class of organic compounds, pale yellow biological pigments that fluoresce green.

They occur in compounds essential to life as coenzymes in metabolism. Plants and microbes can synthesize them, but animals must consume them in the diet. Riboflavin is the best-known flavin.

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also called  Lyochrome,  

      any of a group of pale-yellow, greenly fluorescent biological pigments (biochromes) widely distributed in small quantities in plant and animal tissues. Flavins are synthesized only by bacteria, yeasts, and green plants; for this reason, animals are dependent on plant sources for them, including riboflavin (vitamin B2), the most prevalent member of the group.

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Universalium. 2010.

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