A colorless highly toxic gas and one of the simplest compounds of arsenic. Arsine has a garlic-like or fishy odor. Because arsine is nonirritating and produces no immediate symptoms, persons exposed to hazardous levels of it may be unaware of its presence. Arsine is water soluble. It is generally shipped in cylinders as a liquefied compressed gas. [..]

(n) a poisonous colorless flammable gas used in organic synthesis and to dope transistors and as a poison gas in warfare