1. a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium; [syn: iridium, Ir, atomic number 77]
WordNet (r) 3.0 (2006):
atomic number 77
n 1: a heavy brittle metallic element of the platinum group;
used in alloys; occurs in natural alloys with platinum or
osmium [syn: iridium, Ir, atomic number 77]