PYGOSTYLE
\pˈa͡ɪɡəstˌa͡ɪl], \pˈaɪɡəstˌaɪl], \p_ˈaɪ_ɡ_ə_s_t_ˌaɪ_l]\
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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 vertebrae, and supports the uropigium.
By Oddity Software
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An upturned compressed bone at the end of the vertebral column of Birds, formed by fusion of the four or more hindmost vertebrae.
By Henderson, I. F.; Henderson, W. D.