Term Name:	uropygial gland
Synonyms:	oil gland, preen gland, preen oil gland
Definition:	A large gland at the base of a bird's tail dorsal to the cloaca at the end of the pygostyle that secretes an oil used in preening. It opens through a caudally directed nipple.
Ontology:	Uberon Ontology [UBERON:0007802]