hydriodic, a. [Hydr- + iodic: cf. F. hydriodique.].
Pertaining to, or derived from, hydrogen and iodine; -- said of an acid (HI) produced by the combination of these elements. [1913 Webster]
Hydriodic acid (Chem.)
, a pungent, colorless gas, HI, usually prepared as a solution in water. It is strong reducing agent. Called also hydrogen iodide.