iridium

Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++

Related topics: Elements

i·rid·i·um /ɪˈrɪdiəm/ noun [uncountable] HCEMHa hard and very heavy metal that is combined with platinum to make jewellery and is used in scientific instruments. It is a chemical element: symbol Ir 铱〔一种化学元素，符号为 Ir〕

Examples from the Corpus

iridium• Like Green's compound, this iridium compound contains two hydrogen atoms that can be eliminated by light.Origin iridium (1800-1900) Latin iris ( → IRIS); because when it becomes liquid in a particular acid, it shows the colors of the rainbow

i·rid·i·um nounChineseSyllable

very hard metal Corpus and is that a heavy

iridium
i‧rid‧i‧um /ɪˈrɪdiəm/

noun [uncountable]

Date: 1800-1900
Language: Latin
Origin: iris ( ⇨ iris); because when it becomes liquid in a particular acid, it shows the colors of the rainbow

a hard and very heavy metal that is combined with platinum to make jewellery and is used in scientific instruments. It is a chemical element: symbol Ir

irid·ium

BrE

/ɪˈrɪdiəm/

🔊

NAmE

/ɪˈrɪdiəm/

🔊

noun

[uncountable]

(symbol

)

a chemical element. Iridium is a very hard yellow-white metal, used especially in making alloys. 铱