noun Biochemistry.

a complex heterocyclic ketone that is common to the nonprotein part of several important yellow enzymes, the flavoproteins.

Also flavine.

Origin of flavin

First recorded in 1850–55; flav- + -in2


a combining form occurring in compound words which denote natural derivatives of flavin: riboflavin.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for flavin

Contemporary Examples of flavin

Historical Examples of flavin

  • Flavin observed a duck, which he thought to be of this species, at Guam on January 19, 1946.

  • To obtain a yellow shade of scarlet, a small quantity of Flavin, Fustic, or other yellow dye may be added to the dye bath.

    Vegetable Dyes

    Ethel M. Mairet

  • Flavin is extract of Quercitron bark, and is much used for bright yellow with tin.

    Vegetable Dyes

    Ethel M. Mairet

  • Yellows can be got with weld, flavin, turmeric (for which cotton has a strong attraction), and fustic.

    Vegetable Dyes

    Ethel M. Mairet

  • Flavin, add both to the bath together with indigo extract (1/2 tablespoonful).

    Vegetable Dyes

    Ethel M. Mairet

British Dictionary definitions for flavin




a heterocyclic ketone that forms the nucleus of certain natural yellow pigments, such as riboflavin. Formula: C 10 H 6 N 4 O 2See flavoprotein
any yellow pigment based on flavin
another name for quercetin

Word Origin for flavin

C19: from Latin flāvus yellow
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

flavin in Medicine




Any of various water-soluble yellow pigments, including riboflavin, found in plant and animal tissue as coenzymes of flavoproteins.
A ketone that gives color to various natural yellow pigments.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.