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barn
noun
a
large
farm
building
used
for
storing
hay
or
grain
and
for
housing
livestock
•
The
farmer
walked
into
the
barn
to
feed
the
cows
.
The
farmer
walked
into
the
barn
to
feed
the
cows
.
•
During
the
storm
,
the
chickens
took
shelter
inside
the
old
red
barn
.
During
the
storm
,
the
chickens
took
shelter
inside
the
old
red
barn
.
Old
English
“
bereærn
”
meaning
“
barley
house
,”
from
“
bere
” (
barley
)
+
“
ærn
” (
storehouse
),
later
generalized
to
any
farm
storehouse
.
noun
a
unit
of
area
equal
to
10⁻²⁸
square
metres
,
used
in
nuclear
physics
to
express
the
effective
cross-section
of
atomic
or
subatomic
particles
•
In
nuclear
physics
,
a
cross-section
of
one
barn
is
surprisingly
huge
on
the
atomic
scale
.
In
nuclear
physics
,
a
cross-section
of
one
barn
is
surprisingly
huge
on
the
atomic
scale
.
•
The
probability
of
the
reaction
increases
to
several
barns
at
low
energies
.
The
probability
of
the
reaction
increases
to
several
barns
at
low
energies
.
Coined
humorously
by
American
physicists
in
the
1940s
,
comparing
the
relatively
large
nuclear
target
to
the
easy-to-hit
broad
side
of
a
barn
.
