Definition of Germinal layers
(Biol.)
the
two
layers
of
cells
,
the
ectoblast
and
entoblast
,
which
form
respectively
the
outer
covering
and
inner
wall
of
the
gastrula
.
A
third
layer
of
cells
,
the
mesoblast
,
which
is
formed
later
and
lies
between
these
two
,
is
sometimes
included
.
See also:
Germinal
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