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iridium

i·rid·i·um

iridium

 
pronunciation:
ih rI di m
features:
Word Combinations (noun)
part of speech: noun
definition: a chemical element that has seventy-seven protons in each nucleus and that occurs as a lustrous yellowish white, extremely hard, dense, and corrosion-resistant metal, used as a hardening alloy, esp. with precious metals. (symbol: Ir)
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