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radiation
noun
-
radiation
Energy
such
as
light
,
heat
,
or
X-rays
that
travels
outward
from
a
source
in
waves
or
tiny
particles
.
•
The
radiation
from
the
sun
keeps
our
planet
warm
.
The
radiation
from
the
sun
keeps
our
planet
warm
.
•
Microwave
ovens
use
radiation
to
heat
food
quickly
.
Microwave
ovens
use
radiation
to
heat
food
quickly
.
From
Latin
radiatio
“
a
shining
,
radiation
,”
from
radius
“
ray
”,
referring
to
things
that
spread
outward
like
rays
of
light
.
noun
-
radiation
The
use
of
carefully
controlled
high-energy
rays
to
treat
diseases
,
especially
cancer
.
•
After
surgery
,
Maria
received
radiation
to
kill
any
remaining
tumor
cells
.
After
surgery
,
Maria
received
radiation
to
kill
any
remaining
tumor
cells
.
•
The
doctor
explained
that
radiation
could
shrink
the
tumor
before
the
operation
.
The
doctor
explained
that
radiation
could
shrink
the
tumor
before
the
operation
.
Extension
of
the
physical
sense
to
medicine
in
the
early
20th
century
,
when
scientists
learned
to
direct
ionizing
rays
at
diseased
tissue
.
