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請輸入英文單字，中文詞皆可：
hafnium 音標拼音: [h'æfniəm]
XDict
n
. 鉿
PyDict
鉿
WordNet
(
r
)
3
.
0
(
2006
) (
WordNet
)
hafnium
n
1
:
a
grey
tetravalent
metallic
element
that
resembles
zirconium
chemically
and
is
found
in
zirconium
minerals
;
used
in
filaments
for
its
ready
emission
of
electrons
[
synonym
:
{
hafnium
}, {
Hf
}, {
atomic
number
72
}]
The
Collaborative
International
Dictionary
of
English
v
.
0
.
48
(
gcide
)
hafnium
\
haf
"
ni
*
um
\ (
h
[
a
^]
f
"
n
[=
e
]*[
u
^]
m
or
h
[
aum
]
f
"
n
[=
e
]*[
u
^]
m
),
n
.
A
metallic
element
of
atomic
number
72
present
together
with
zirconium
to
the
extent
of
1
%
to
5
%
in
zirconium
minerals
.
It
is
a
poisonous
,
ductile
metal
with
a
brilliant
silver
luster
,
has
an
atomic
weight
of
178
.
49
,
and
has
a
high
melting
point
(
2227
[
deg
]
C
).
It
is
used
in
nuclear
reactors
,
and
incandescent
lamps
as
a
scavenger
of
oxygen
and
nitrogen
.
See
also
{
norium
}.
[
1913
Webster
]
The
Elements
Database
(
element
)
hafnium
Symbol
:
Hf
Atomic
number
:
72
Atomic
weight
:
178
.
49
Silvery
lustrous
metallic
transition
element
.
Used
in
tungsten
alloys
in
filaments
and
electrodes
,
also
acts
as
a
neutron
absorber
.
First
reported
by
Urbain
in
1911
,
existence
was
finally
established
in
1923
by
D
.
Coster
,
G
.
C
.
de
Hevesy
in
1923
.
English
-
Spanish
(
Internet
Dictionary
Project
)
hafnio
[
Noun
]
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