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lung
noun
one
of
the
two
soft
,
elastic
organs
inside
the
chest
that
take
in
air
so
that
oxygen
can
enter
the
blood
and
carbon
dioxide
can
leave
the
body
•
During
exercise
,
your
lungs
work
harder
to
supply
oxygen
to
your
muscles
.
During
exercise
,
your
lungs
work
harder
to
supply
oxygen
to
your
muscles
.
•
The
doctor
listened
to
her
lung
sounds
with
a
stethoscope
.
The
doctor
listened
to
her
lung
sounds
with
a
stethoscope
.
Old
English
lungen
,
from
Proto-Germanic
*lungan
,
probably
related
to
a
root
meaning
“
light
in
weight
,”
because
lungs
are
full
of
air
.
noun
a
large
area
of
trees
,
plants
,
or
water
that
is
compared
to
a
lung
because
it
provides
fresh
air
or
absorbs
pollution
for
a
city
,
region
,
or
the
planet
•
The
vast
forest
is
considered
the
lung
of
the
region
,
absorbing
carbon
dioxide
and
producing
oxygen
.
The
vast
forest
is
considered
the
lung
of
the
region
,
absorbing
carbon
dioxide
and
producing
oxygen
.
•
City
planners
call
the
central
park
the
city's
green
lung
.
City
planners
call
the
central
park
the
city's
green
lung
.
noun
a
machine
or
device
that
moves
air
in
and
out
of
a
patient
’
s
body
or
oxygenates
blood
when
the
natural
lungs
cannot
,
such
as
an
iron
lung
or
an
artificial
lung
in
surgery
•
The
patient
was
kept
alive
by
an
artificial
lung
during
surgery
.
The
patient
was
kept
alive
by
an
artificial
lung
during
surgery
.
•
In
the
1950s
,
many
polio
victims
relied
on
an
iron
lung
to
breathe
.
In
the
1950s
,
many
polio
victims
relied
on
an
iron
lung
to
breathe
.