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π
roof
noun
the
structure
that
covers
the
top
of
a
building
or
vehicle
and
protects
the
inside
from
rain
,
sun
,
or
snow
β’
Heavy
rain
drummed
on
the
metal
roof
of
the
barn
.
Heavy
rain
drummed
on
the
metal
roof
of
the
barn
.
β’
They
climbed
onto
the
flat
roof
to
watch
the
fireworks
.
They
climbed
onto
the
flat
roof
to
watch
the
fireworks
.
Old
English
β
hrΕf
β
meaning
β
covering
β
or
β
ceiling
,β
related
to
German
β
Ruf
,β
originally
referring
to
any
overhead
covering
.
verb
to
put
or
build
a
roof
on
something
;
to
cover
the
top
of
a
building
β’
They
hired
experts
to
roof
the
new
house
with
solar
panels
.
They
hired
experts
to
roof
the
new
house
with
solar
panels
.
β’
The
shed
was
quickly
roofed
with
corrugated
sheets
before
the
storm
arrived
.
The
shed
was
quickly
roofed
with
corrugated
sheets
before
the
storm
arrived
.
Old
English
β
hrΕfian
,β
from
the
noun
β
roof
,β
meaning
β
to
provide
with
a
covering
above
.β
noun
a
maximum
level
or
limit
that
something
cannot
go
beyond
β’
The
government
set
a
roof
on
rent
increases
to
protect
tenants
.
The
government
set
a
roof
on
rent
increases
to
protect
tenants
.
β’
With
interest
rates
through the roof
,
many
families
struggle
to
buy
homes
.
With
interest
rates
through the roof
,
many
families
struggle
to
buy
homes
.
Extended
figurative
use
of
the
concrete
sense
,
first
recorded
in
the
early
20th
century
,
comparing
a
rising
quantity
to
something
hitting
a
building
β
s
roof
.
proof
noun
facts
or
information
that
show
something
is
true
or
real
β’
The
fingerprints
on
the
glass
were
clear
proof
that
the
burglar
had
been
inside
.
The
fingerprints
on
the
glass
were
clear
proof
that
the
burglar
had
been
inside
.
β’
Do
you
have
any
proof
that
the
package
was
mailed
last
week
?
Do
you
have
any
proof
that
the
package
was
mailed
last
week
?
Middle
English
,
from
Old
French
β
preve
β,
from
Latin
β
proba
β
meaning
β
test
β.
adjective
able
to
resist
or
not
be
harmed
by
something
,
especially
water
,
fire
,
or
bullets
β’
The
safe
is
fire-proof
and
can
protect
documents
during
a
blaze
.
The
safe
is
fire-proof
and
can
protect
documents
during
a
blaze
.
β’
She
bought
a
water-proof
jacket
for
the
hiking
trip
.
She
bought
a
water-proof
jacket
for
the
hiking
trip
.
Extension
of
the
noun
sense
β
test
β:
something
that
has
passed
the
test
is
β
proof
β
against
it
.
noun
a
preliminary
printed
copy
of
a
text
or
photo
made
so
that
mistakes
can
be
found
and
fixed
β’
The
editor
marked
the
first
proof
with
bright
red
ink
.
The
editor
marked
the
first
proof
with
bright
red
ink
.
β’
Please
read
the
page
proofs
carefully
before
we
go
to
press
.
Please
read
the
page
proofs
carefully
before
we
go
to
press
.
Use
in
printing
dates
from
the
1600s
,
when
trial
sheets
were
pulled
from
a
press
to
β
prove
β
type
was
set
correctly
.
noun
a
logical
set
of
steps
that
shows
a
mathematical
statement
must
be
true
β’
In
today
β
s
class
we
wrote
a
proof
for
the
Pythagorean
theorem
.
In
today
β
s
class
we
wrote
a
proof
for
the
Pythagorean
theorem
.
β’
A
rigorous
proof
leaves
no
room
for
doubt
or
guesswork
.
A
rigorous
proof
leaves
no
room
for
doubt
or
guesswork
.
The
idea
of
formal
mathematical
proof
was
developed
by
ancient
Greek
mathematicians
such
as
Euclid
.
noun
-
proof
a
number
showing
the
strength
of
an
alcoholic
drink
β’
The
rum
is
bottled
at
100
proof
,
making
it
quite
strong
.
The
rum
is
bottled
at
100
proof
,
making
it
quite
strong
.
β’
In
the
United
States
,
80
proof
spirits
are
common
in
stores
.
In
the
United
States
,
80
proof
spirits
are
common
in
stores
.
Derived
from
the
18th-century
practice
of
β
proving
β
spirits
by
mixing
them
with
gunpowder
to
test
flammability
β
if
it
ignited
,
the
spirit
was
β
above
proof
β.
verb
to
treat
or
cover
something
so
that
it
becomes
resistant
to
water
,
fire
,
etc
.
β’
We
need
to
proof
the
tent
before
our
camping
trip
.
We
need
to
proof
the
tent
before
our
camping
trip
.
β’
The
laboratory
proofed
the
fabric
against
chemical
spills
.
The
laboratory
proofed
the
fabric
against
chemical
spills
.
Verb
use
comes
from
the
idea
of
β
making
something
proof
ββ
ensuring
it
passes
a
test
of
resistance
.
verb
to
allow
bread
dough
to
rest
so
that
it
rises
before
baking
β’
Cover
the
bowl
and
let
the
dough
proof
for
an
hour
.
Cover
the
bowl
and
let
the
dough
proof
for
an
hour
.
β’
The
baker
proofed
the
baguette
dough
twice
for
better
texture
.
The
baker
proofed
the
baguette
dough
twice
for
better
texture
.
Baking
sense
arose
in
the
19th
century
from
β
prove
the
yeast
ββ
testing
that
it
was
active
by
letting
dough
rise
.
