iridious, a. Chem.
(aɪˈrɪdɪəs)
[f. iridi-um + -ous. Cf. F. irideux (Littré).]
Containing iridium; applied to compounds in which iridium is trivalent, as IrCl3: cf. iridic.
| 1865–72 Watts Dict. Chem. III. 322 The sesquioxide [of iridium] or Iridious oxide, Ir2O3. 1873 ― Fownes' Chem. (ed. 11) 434 The trichloride or Iridious Chloride, is prepared by strongly heating iridium with nitre. |