pygostyle(redirected from pygostyles)
Also found in: Dictionary, Encyclopedia.
pygostylethe upturned tip of the vertebral column of birds consisting of fused vertebrae.
a bony termination of the vertebral column in birds formed by fusion of the last four to eight spinal vertebrae. Called also plowshare bone or rump post. The tail feathers are attached to its fascia so that it is very important in flight.