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Noun: uropygium  ,yû-ru'pi-jee-um or ,yû-ru'pI-jee-um
  1. Posterior part of a bird's body from which the tail feathers grow
    "The uropygium contains the preen gland, which produces oil for feather maintenance"

Derived forms: uropygiums

Type of: tail

Part of: bird, birdie [informal]

Encyclopedia: Uropygium