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solar
adjective
coming
from
,
caused
by
,
or
relating
to
the
sun
•
During
a
solar
eclipse
,
the
sky
grows
strangely
dark
in
the
middle
of
the
day
.
During
a
solar
eclipse
,
the
sky
grows
strangely
dark
in
the
middle
of
the
day
.
•
Scientists
study
solar
flares
to
understand
how
they
affect
radio
signals
on
Earth
.
Scientists
study
solar
flares
to
understand
how
they
affect
radio
signals
on
Earth
.
From
Latin
solāris
,
from
sol
meaning
“
sun
”.
adjective
using
the
sun
’
s
light
or
heat
to
produce
energy
•
The
school
installed
new
solar
panels
to
lower
its
electricity
bills
.
The
school
installed
new
solar
panels
to
lower
its
electricity
bills
.
•
She
bought
a
lamp
that
charges
its
battery
with
a
small
solar
cell
.
She
bought
a
lamp
that
charges
its
battery
with
a
small
solar
cell
.
Sense
developed
in
the
20th
century
as
technology
began
turning
sunlight
directly
into
usable
power
.
adjective
based
on
the
sun
’
s
apparent
movement
,
especially
when
measuring
time
such
as
the
solar
year
•
A
solar
day
is
about
four
minutes
longer
than
a
sidereal
day
.
A
solar
day
is
about
four
minutes
longer
than
a
sidereal
day
.
•
The
ancient
Egyptians
created
a
365-day
solar
calendar
.
The
ancient
Egyptians
created
a
365-day
solar
calendar
.
This
time-keeping
sense
dates
to
medieval
astronomy
,
distinguishing
measurements
tied
to
the
sun
from
those
tied
to
stars
.
noun
(
historical
)
a
private
upper
room
or
sunny
sitting
room
in
a
medieval
English
house
•
The
lord
withdrew
to
the
solar
to
discuss
family
matters
with
his
wife
.
The
lord
withdrew
to
the
solar
to
discuss
family
matters
with
his
wife
.
•
In
many
castles
,
the
solar
was
the
warmest
and
most
comfortable
place
during
winter
.
In
many
castles
,
the
solar
was
the
warmest
and
most
comfortable
place
during
winter
.
Middle
English
,
from
Old
French
,
literally
“
of
the
sun
,”
referring
to
a
sunlit
upper
chamber
.