COMMON & BRAND NAMES
Anaesthetic Volatile Solvent
Ether is a volatile liquid that's vapors act as an anaesthetic when inhaled. It has been used both medically and recreationally since the late 1800s.
Ether is Extremely Flammable. Also note that diethyl-ether and "petroleum ether" are different substances. "Petroleum ether" is not an ether.