Definitions

1. adjective

relating to or produced by the uropygial gland, a gland that produces preen oil in birds.

“The uropygial gland is responsible for producing the oil that helps keep a bird’s feathers in place.”

2. noun

the uropygial gland or its secretion, especially in birds.

“The bird used its uropygial to coat its feathers with protective oil.”

3. noun

a substance secreted by the uropygial gland, especially in birds, used to preen and maintain the feathers.

“The bird applied its uropygial to its ruffled feathers, smoothing them out.”