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5 definitions found
From:
DICT.TW English-Chinese Dictionary 英漢字典
vacuum tube
真空管
From:
DICT.TW English-Chinese Medical Dictionary 英漢醫學字典
vacuum tube
名詞
電子管,真空管
From:
Taiwan MOE computer dictionary
vacuum
tube
真空管
From:
Webster's Revised Unabridged Dictionary (1913)
Vac·u·um
n.
;
pl
.
E
.
Vacuums
L
.
Vacua
1.
Physics
A
space
entirely
devoid
of
matter
(
called
also
,
by
way
of
distinction
,
absolute
vacuum
);
hence
,
in
a
more
general
sense
,
a
space
,
as
the
interior
of
a
closed
vessel
,
which
has
been
exhausted
to
a
high
or
the
highest
degree
by
an
air
pump
or
other
artificial
means
;
as
,
water
boils
at
a
reduced
temperature
in
a
vacuum
.
2.
The
condition
of
rarefaction
,
or
reduction
of
pressure
below
that
of
the
atmosphere
,
in
a
vessel
,
as
the
condenser
of
a
steam
engine
,
which
is
nearly
exhausted
of
air
or
steam
,
etc
.;
as
,
a
vacuum
of
26
inches
of
mercury
,
or
13
pounds
per
square
inch
.
Vacuum brake
,
a
kind
of
continuous
brake
operated
by
exhausting
the
air
from
some
appliance
under
each
car
,
and
so
causing
the
pressure
of
the
atmosphere
to
apply
the
brakes
.
Vacuum pan
Technol.
,
a
kind
of
large
closed
metallic
retort
used
in
sugar
making
for
boiling
down
sirup
.
It
is
so
connected
with
an
exhausting
apparatus
that
a
partial
vacuum
is
formed
within
.
This
allows
the
evaporation
and
concentration
to
take
place
at
a
lower
atmospheric
pressure
and
hence
also
at
a
lower
temperature
,
which
largely
obviates
the
danger
of
burning
the
sugar
,
and
shortens
the
process
.
Vacuum pump
.
Same
as
Pulsometer
, 1.
Vacuum tube
Phys.
,
(a)
a
glass
tube
provided
with
platinum
electrodes
and
exhausted
,
for
the
passage
of
the
electrical
discharge
;
a
Geissler
tube
.
(a)
any
tube
used
in
electronic
devices
,
containing
a
vacuum
and
used
to
control
the
flow
of
electrons
in
a
circuit
,
as
a
vacuum
diode
,
triode
,
tetrode
,
or
pentode
.
Vacuum valve
,
a
safety
valve
opening
inward
to
admit
air
to
a
vessel
in
which
the
pressure
is
less
than
that
of
the
atmosphere
,
in
order
to
prevent
collapse
.
Torricellian vacuum
.
See
under
Torricellian
.
◄
►
From:
WordNet (r) 2.0
vacuum
tube
n
:
electronic
device
consisting
of
a
system
of
electrodes
arranged
in
an
evacuated
glass
or
metal
envelope
[
syn
:
tube
,
thermionic vacuum tube
,
thermionic tube
, {
electron
tube
,
thermionic valve
]
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