iridium: Meaning and Definition of

i•rid•i•um

Pronunciation: (i-rid'ē-um, ī-rid'-), [key]
— n. Chem.
  1. a precious metallic element resembling platinum: used in platinum alloys and for the points of gold pens. Symbol: Ir; at. wt.: 192.2; at. no.: 77; sp. gr.: 22.4 at 20°C.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
iridic iridize
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