Definition of Yolk
Pronunciation:
yōlk
or
yōk; 277
n.
1.
1.
The
yellow
part
of
an
egg
;
the
vitellus
.
2.
(Zool.)
An
oily
secretion
which
naturally
covers
the
wool
of
sheep
.
Yolk cord
(Zool.)
a
slender
cord
or
duct
which
connects
the
yolk
glands
with
the
egg
chambers
in
certain
insects
,
as
in
the
aphids
.
Yolk gland
(Zool.)
a
special
organ
which
secretes
the
yolk
of
the
eggs
in
many
turbellarians
,
and
in
some
other
invertebrates
.
See
Illust.
of
Hermaphrodite
in
Appendix
.
Yolk sack
(Anat.)
the
umbilical
vesicle
.
See
under
Unbilical
.
Related Words
egg
,
food
,
nutrient
,
vitellus
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