noun Biochemistry.

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

  1. a combining form occurring in compound words which denote natural derivatives of flavin: riboflavin.


  1. 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
  2. any yellow pigment based on flavin
  3. another name for quercetin


  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.

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