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bulb
noun
a
glass
or
plastic
device
that
produces
light
when
electricity
passes
through
it
,
typically
screwed
into
a
lamp
or
ceiling
fixture
•
The
hallway
went
dark
when
the
old
bulb
burned
out
.
The
hallway
went
dark
when
the
old
bulb
burned
out
.
•
She
replaced
the
lamp
’
s
regular
bulb
with
an
energy-saving
LED
one
.
She
replaced
the
lamp
’
s
regular
bulb
with
an
energy-saving
LED
one
.
Extended
from
the
rounded
shape
of
plant
bulbs
to
the
glass
enclosure
of
early
electric
lamps
in
the
late
19th
century
.
noun
a
rounded
underground
part
of
some
plants
that
stores
food
and
can
grow
into
a
new
plant
,
like
an
onion
or
a
tulip
•
We
planted
each
onion
bulb
a
few
inches
deep
in
the
soil
.
We
planted
each
onion
bulb
a
few
inches
deep
in
the
soil
.
•
The
tulip
bulbs
will
burst
into
bright
red
and
yellow
flowers
next
spring
.
The
tulip
bulbs
will
burst
into
bright
red
and
yellow
flowers
next
spring
.
From
Latin
bulbus
,
from
Greek
bolbos
meaning
‘
onion
’.
noun
any
small
,
rounded
swelling
at
the
end
of
an
object
or
in
the
body
,
such
as
the
rubber
part
of
a
dropper
or
the
base
of
a
thermometer
•
Squeeze
the
rubber
bulb
to
draw
liquid
into
the
pipette
.
Squeeze
the
rubber
bulb
to
draw
liquid
into
the
pipette
.
•
The
mercury
rises
from
the
bulb
at
the
bottom
of
the
thermometer
as
the
temperature
increases
.
The
mercury
rises
from
the
bulb
at
the
bottom
of
the
thermometer
as
the
temperature
increases
.
Generalized
use
from
the
idea
of
a
rounded
plant
bulb
.
lightbulb
noun
a
glass
or
plastic
bulb
that
produces
light
when
an
electric
current
passes
through
a
filament
or
gas
inside
it
.
•
I
bought
a
pack
of
new
lightbulbs
at
the
store
.
I
bought
a
pack
of
new
lightbulbs
at
the
store
.
•
The
lightbulb
above
the
kitchen
table
burnt
out
last
night
.
The
lightbulb
above
the
kitchen
table
burnt
out
last
night
.
Late
19th
century
:
from
'light'
+
'bulb'
,
referring
to
the
pear-shaped
glass
enclosure
.
The
practical
incandescent
version
was
invented
by
Thomas
Edison
in
1879
.
noun
a
moment
of
sudden
understanding
or
inspiration
.
•
Seeing
the
diagram
made
a
lightbulb
go
on
in
my
head
.
Seeing
the
diagram
made
a
lightbulb
go
on
in
my
head
.
•
It
was
a
real
lightbulb
moment
when
he
figured
out
the
answer
.
It
was
a
real
lightbulb
moment
when
he
figured
out
the
answer
.
The
figurative
use
draws
from
the
literal
device
turning
on
to
illuminate
,
popularized
in
20th-century
cartoons
where
a
lightbulb
appears
over
a
character's
head
for
ideas
.