Hydriodic

Hy`dri`od´ic


a.1.(Chem.) Pertaining to, or derived from, hydrogen and iodine; - said of an acid (HI) produced by the combination of these elements.
Hydriodic acid
(Chem.) a pungent, colorless gas, HI, usually prepared as a solution in water. It is strong reducing agent. Called also hydrogen iodide.