Definition of Uropygial
U`ro`pyg´i`al
a.
1.
(Anat.)
Of
or
pertaining
to
the
uropygium
,
or
prominence
at
the
base
of
the
tail
feathers
,
in
birds
.
Uropygial gland
a
peculiar
sebaceous
gland
at
the
base
of
the
tail
feathers
in
most
birds
.
It
secretes
an
oily
fluid
which
is
spread
over
the
feathers
by
preening
.
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