Definition

Noun: - The posterior terminal part of a bird's body, specifically the fleshy and often protruding region from which the tail feathers grow. It is the area surrounding the caudal vertebrae and the opening of the cloaca.

Usage

• The term is used in formal ornithological and zoological contexts to describe avian anatomy.
• It refers specifically to the external morphological feature, not the internal structures or the tail feathers themselves.

Examples

• The bird preened its uropygium to keep the feathers around it clean and aligned.
• In many bird species, the uropygium is covered by a specialized gland, the uropygial or preen gland.
• The ornithologist noted the distinctive shape and size of the bird's uropygium for identification purposes.

Advanced Usage

• The term is almost exclusively used in scientific descriptions and is not common in everyday language.
• It can be used in a comparative anatomical context when discussing different bird families.

Variants and Related Words

• Uropygial (Adjective): Pertaining to the uropygium.
  • The uropygial gland secretes oils used by the bird for preening.

Synonyms

• Rump (though this is a more general term for the hind part of an animal's body and is less precise).
• Pygostyle region (refers more specifically to the fused terminal vertebrae supporting the tail feathers, which are part of the uropygium's underlying structure).

Notes on Different Meanings

• This word has a single, highly specific meaning in zoology. It does not have other common definitions or usages in general English.

Noun

1. posterior part of a bird's body from which the tail feathers grow