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corundum 音標拼音: [kɚ'ʌndəm]
XDict
n
. 剛玉,金剛砂
PyDict
剛玉,金剛砂
WordNet
(
r
)
3
.
0
(
2006
) (
WordNet
)
corundum
n
1
:
very
hard
mineral
used
as
an
abrasive
[
synonym
: {
corundom
},
{
corundum
}]
The
Collaborative
International
Dictionary
of
English
v
.
0
.
48
(
gcide
)
Corundum
\
Co
*
run
"
dum
\ (
k
[-
o
]*
r
[
u
^]
n
"
d
[
u
^]
m
),
n
.;
pl
. {
Corundums
}
(
k
[-
o
]*
r
[
u
^]
n
"
d
[
u
^]
mz
). [
Also
corindon
.] [
From
Hind
.
kurand
corundum
stone
.] (
Min
.)
The
mineral
alumina
({
Al2O3
}),
as
found
native
in
a
crystalline
state
.
Transparent
varieties
are
used
as
gemstones
,
including
{
sapphire
},
which
is
the
fine
blue
variety
;
the
{
oriental
ruby
},
or
red
sapphire
;
the
{
oriental
amethyst
},
or
purple
sapphire
;
and
{
adamantine
spar
},
the
hair
-
brown
variety
.
It
is
the
hardest
substance
found
native
,
next
to
the
diamond
.
[
1913
Webster
PJC
]
Note
:
The
name
corundum
is
sometimes
restricted
to
the
non
-
transparent
or
coarser
kinds
. {
Emery
}
is
a
dark
-
colored
granular
variety
,
usually
admixed
with
magnetic
iron
ore
.
[
1913
Webster
]
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