What is "ammonia borane"

n. (context inorganic compound English) An inorganic hydride of nitrogen and boron, NH₃BH₃, proposed as a source of hydrogen in motor vehicles.

Ammonia borane (also systematically named amminetrihydridoboron), also called borazane, is the chemical compound with the formula HNBH. The colourless or white solid is the simplest molecular boron- nitrogen- hydride compound. It has attracted attention as a source of hydrogen fuel, but is otherwise only of academic interest.