Hydriodic /(?)/

Hy·dri·od·ic

Hydriodic

a.
  1. Pertaining to, or derived from, hydrogen and iodine; -- said of an acid (HI) produced by the combination of these elements. (Chem.)

Phrases & Compounds
Hydriodic acid
a pungent, colorless gas, HI, usually prepared as a solution in water. It is strong reducing agent. Called also hydrogen iodide.