iridious

from The Century Dictionary.

• In chem., containing iridium: applied to compounds in which iridium is trivalent, as IrCl₃. Compare iridic.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Chem.) Of or pertaining to iridium; -- applied specifically to compounds in which iridium has a low valence.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective chemistry containing trivalent iridium