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(vertebrate zoology)
A specialized bone in birds which is formed by a number of fused tail vertebrae.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



in most birds (except ratites and tinamous), a bone formed from four to six concresced posterior caudal vertebrae. The pygostyle, which is a flattened vertical plate, serves to anchor the rectrices forming the tail of the bird.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.