a colourless poisonous corrosive gas obtained by a catalysed reaction between hydrogen and iodine vapour: used in making iodides. Formula: HI
2.
an aqueous solution of this gas; hydriodic acid
hydrogen iodide in American English
noun
a colorless gas, HI, having a suffocating odor: the anhydride of hydriodic acid
Word origin
[1895–1900]This word is first recorded in the period 1895–1900. Other words that entered Englishat around the same time include: apothecaries' measure, frame of reference, hit-and-run, neon, slapstick