Definify.com
Webster 1913 Edition
Pygostyle
Py′go-style
,Noun.
 [Gr. 
πυγή 
the rump + [GREEK] a pillar.] (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. 
Definition 2025
pygostyle
pygostyle
English
Noun
pygostyle (plural pygostyles)
-  The plate supporting the tail-feathers in birds, formed from fused vertebrae.
-  1971, Anthony Burgess, M/F, Penguin (2004), page 158:
- Aderyn the Bird Queen sat down; her pygostyle engaged a hard wooden bottom.
 
 
 -  1971, Anthony Burgess, M/F, Penguin (2004), page 158:
 
Synonyms
- parson’s nose
 - ploughshare bone
 - pope’s nose
 - sultan’s nose