Definify.com
Webster 1913 Edition
Iridious
I-rid′i-ous
(ī̍-rĭd′ĭ-ŭs)
, Adj.
(Chem.)
Of or pertaining to iridium; – applied specifically to compounds in which iridium has a low valence.
☞ Iridium usually occurs as a native alloy with osmium (iridosmine or osmiridium), which may occur alone or with platinum. Iridium, as an alloy with platinum, is used in bushing the vents of heavy ordnance. It is also used for the points of gold pens, and in a finely powdered condition (iridium black), for painting porcelain black.