Diiodide

from The Collaborative International Dictionary of English v.0.48

Diiodide \Di*i"o*dide\ (?; 104), n. [Pref. di- + iodine.]
   (Chem.)
   A compound of a binary type containing two atoms of iodine;
   -- called also {biniodide}.
   [1913 Webster] diiodotyrosine