- a colorless gas, HI, having a suffocating odor: the anhydride of hydriodic acid.
Origin of hydrogen iodide
First recorded in 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a colourless poisonous corrosive gas obtained by a catalysed reaction between hydrogen and iodine vapour: used in making iodides. Formula: HI
- an aqueous solution of this gas; hydriodic acid
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