- a complex heterocyclic ketone, CHNO
- any of a group of yellow pigments, derived from this ketone and occurring in certain plant and animal products or prepared by synthesis; specif., riboflavin
Origin of flavinfrom Classical Latin flavus, yellow (see flavone) + -in
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.