What is "boron triiodide"

n. (context inorganic compound English) A binary compound of boron and iodine, BI₃; it is a crystalline solid.

Boron triiodide is a chemical compound of boron and iodine with chemical formula BI. It has a trigonal planar molecular geometry. It is a crystalline solid, which reacts vigorously with water to form boric acid. Its dielectric constant is 5.38 and its heat of vaporization is 40.5 kJ/mol. At extremely high pressures, BI becomes metallic at ~23 GPa and is a superconductor above ~27 GPa.