Definition of Allantois
Al`lan´to`is
n.
1.
(Anat.)
A
membranous
appendage
of
the
embryos
of
mammals
,
birds
,
and
reptiles
, -
in
mammals
serving
to
connect
the
fetus
with
the
parent
;
the
urinary
vesicle
.
Related Words
fetal
membrane
,
mammal
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