The uropygial gland of a bird, which secretes the oil used for preening.
| 单词 | θ38783 | 
| 释义 | the world > animals > birds > parts of or bird defined by > 			[noun]		 > uropygial gland (3)		 note1486 The uropygial gland of a bird, which secretes the oil used for preening. oil gland1835 a gland which secretes oil; spec. the uropygial or coccygeal gland of a bird, which secretes the oil used for preening. preen gland1922 The uropygial gland of a bird, which secretes the oil used for preening. Also called oil gland. | 
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