corundum; a very hard mineral (Al₂O₃)
Tone colorsmāmámǎmàma
Meanings
1 sense · 4 examplesnoun
corundum; a mineral, aluminum oxide (Al₂O₃), second only to diamond in hardness
technicalA technical term in geology and gemology. Transparent red corundum is ruby, other colors are sapphire. Used in jewelry, bearings, and as an abrasive.
Hóng红
bǎo宝
shí石
hé和
lán蓝
bǎo宝
shí石
dōu都
shì是
gāng刚
yù玉
de的
yī一
zhǒng种
。
Ruby and sapphire are both types of corundum.
Gōng工
yè业
shàng上
cháng常
yòng用
gāng刚
yù玉
zuò作
wéi为
yán研
mó磨
cái材
liào料
。
In industry, corundum is often used as an abrasive material.
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Zhè这
zhǒng种
jīng精
mì密
yí仪
qì器
de的
zhóu轴
chéng承
shì是
gāng刚
yù玉
zhì制
chéng成
de的
。
The bearing of this precision instrument is made of corundum.
Gāng刚
yù玉
jīng晶
tǐ体
tōng通
cháng常
chéng呈
tǒng桶
zhuàng状
huò或
zhù柱
zhuàng状
。
Corundum crystals are usually barrel-shaped or columnar.