\Hy`dri*od"ic\, a. [Hydr- + iodic: cf. F.
hydriodique.] (Chem.)
Pertaining to, or derived from, hydrogen and iodine; -- said
of an acid 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}.