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Definition of Pygostyle
1. n. 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.
Definition of Pygostyle
1. Noun. The plate supporting the tail-feathers in birds, formed from fused vertebrae. ¹
¹ Source: wiktionary.com