AMMONIA

noun Etymology: New Latin, from Latin sal ~cus sal ~c, literally, salt of Ammon, from Greek ammōniakos of Ammon, from Ammōn Ammon, Amun, an Egyptian god near whose temple at the Siwa oasis it was extracted Date: 1789 a pungent colorless gaseous alkaline compound of nitrogen and hydrogen NH 3 that is very soluble in water and can easily be condensed to a liquid by cold and pressure, ~ water