pygostylePronunciation: /ˈpʌɪgə(ʊ)stʌɪl/Definition of pygostyle noun Ornithology (in a bird) a triangular plate formed of the fused caudal vertebrae, typically supporting the tail feathers. Origin: late 19th century: from Greek pugē 'rump' + stulos 'column'pygostyle in other Oxford dictionaries Definition of pygostyle in the US English dictionary
