Definition of Penumbra
Pe`num´bra
n.
1.
An
incomplete
or
partial
shadow
.
2.
(Astron.)
The
shadow
cast
,
in
an
eclipse
,
where
the
light
is
partly
,
but
not
wholly
,
cut
off
by
the
intervening
body
;
the
space
of
partial
illumination
between
the
umbra
,
or
perfect
shadow
,
on
all
sides
,
and
the
full
light
.
3.
(Paint.)
The
part
of
a
picture
where
the
shade
imperceptibly
blends
with
the
light
.
Related Words
shadow
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