iridium /irid·i·um/ (Ir) (ĭ-rid´e-um) chemical element, at. no. 77.
iridium (Ir)
iridium (Ir) (irid´ē
m),
iridium Ir 192 an artificial radioactive isotope with a half-life of 75 days, used in radiotherapy.
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. |
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.
iridium (Ir) (irid´ē
m),n a silvery-bluish metallic element. Its atomic number is 77 and its atomic weight is 192.2.
iridium
a chemical element, atomic number 77, atomic weight 192.2, symbol Ir. See Table 6.
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