flavonePronunciation: /ˈfleɪvəʊn/Definition of flavone noun [mass noun] Chemistry a colourless crystalline compound which is the basis of a number of white or yellow plant pigments. A tricyclic aromatic compound; chemical formula: C15H10O2 [count noun] any of the plant pigments of which flavone is the basis. Origin: late 19th century: from Latin flavus 'yellow' + -oneflavone in other Oxford dictionaries Definition of flavone in the US English dictionary