pygostyle

Etymology

From English pygo- + Ancient Greek στῦλος (stûlos, “column”).

noun

  1. The plate supporting the tail-feathers in birds, formed from fused vertebrae.
    Aderyn the Bird Queen sat down; her pygostyle engaged a hard wooden bottom. 1971, Anthony Burgess, M/F, Penguin, published 2004, page 158

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