diiodide
Noun
Meaning
A compound of a binary type containing two atoms of iodine; -- called also biniodide.
Source: Webster's dictionaryPhrases with the word
Examples
The lower oxidation states are stabilized by the larger halogens, so that the trichloride, tribromide, triiodide, and even diiodide are known.
Of the dihalides, difluoride is not known, dichloride is brown, dibromide is black, and diiodide is blue.