1. a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc.; [syn: osmiridium, iridosmine]
WordNet (r) 3.0 (2006):
osmiridium
n 1: a hard and corrosion resistant mineral that is a natural
alloy of osmium and iridium (usually containing small
amounts of rhodium and platinum); used in needles and pen
nibs etc. [syn: osmiridium, iridosmine]