pygostyle Meaning, Definition & Usage

Py"go*style noun
Etymology
Gr. the rump + a pillar.
Definitions
  1. (Anat.) 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.

Webster 1913