uropygial gland

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Related to Preen oil: preen gland

uropygial gland

(yo͝or′ə-pī′jē-əl, -pĭj′ē-)
n.
A large gland at the base of a bird's tail that secretes an oil used in preening. Also called oil gland.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

oil gland

Medspeak
Sebaceous glands; glandulae sebaceae [NA].
 
Zoology
The secretory unit in certain birds responsible for producing and deploying lipid moieties required for “waterproofing” water fowl.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
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Since waterbirds use to spread preen oil over their own (self-preening) or other birds' (allo-preening) plumage, it is easily understandable how these preening activities could facilitate the diffusion of the viruses in nature.
To analyze the odor chemistry of preen oil, the scientists isolated 19 volatile molecules that can achieve a gaseous, more sniff-friendly state.