Definition of pygostyle in English:

pygostyle

Syllabification: py·go·style
Pronunciation: /ˈpīgəˌstīl
 
/

noun

Ornithology
(In a bird) a triangular plate formed of the fused caudal vertebrae, typically supporting the tail feathers.
More example sentences
  • The tail is shortened and fused to form a pygostyle which bears tail feathers (retrices).
  • All birds, both fossil and modern, have reduced the tail to a mass of fused vertebrae termed the pygostyle.

Origin

late 19th century: from Greek pugē 'rump' + stulos 'column'.

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