iridium (redirected from Iridium (element))

iridium /irid·i·um/ (Ir) (ĭ-rid´e-um) chemical element, at. no. 77.

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iridium Ir 192  an artificial radioactive isotope with a half-life of 75 days, used in radiotherapy.

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i·rid·i·um (-rd-m)

n. Symbol Ir

A hard, brittle, corrosion-resistant metallic element, whose radioisotope is used in the treatment of tumors. Atomic number 77.

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iridium (Ir)

[irid′ē·əm]

Etymology: Gk, iris, rainbow

a silvery-bluish metallic element. Its atomic number is 77; its atomic mass is 192.22.

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iridium (Ir) (irid´ēm),

n a silvery-bluish metallic element. Its atomic number is 77 and its atomic weight is 192.2.

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iridium

a chemical element, atomic number 77, atomic weight 192.2, symbol Ir. See Table 6.