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Webster's 1913 Dictionary

PYGOSTYLE

Py "go *style, n. Etym: [Gr. (Anat. )

Defn: The plate of bone which forms the posterior end of the vertebral column in most birds; the plowshare bone; the vomer. It is formed by the union of a number of the last caudal vertebræ, and supports the uropigium.

New American Oxford Dictionary

pygostyle

py go style |ˈpīgəˌstīl ˈpaɪɡəstaɪl | ▶noun Ornithology (in a bird ) a triangular plate formed of the fused caudal vertebrae, typically supporting the tail feathers. ORIGIN late 19th cent.: from Greek pugē ‘rump ’ + stulos ‘column. ’

Oxford Dictionary

pygostyle

pygostyle |ˈpʌɪgə (ʊ )stʌɪl | ▶noun Ornithology (in a bird ) a triangular plate formed of the fused caudal vertebrae, typically supporting the tail feathers. ORIGIN late 19th cent.: from Greek pugē ‘rump ’ + stulos ‘column ’.