/euh mohn"yeuh, euh moh"nee euh/ , n. Chem.
1. a colorless, pungent, suffocating, highly water-soluble, gaseous compound, NH 3 , usually produced by the direct combination of nitrogen and hydrogen gases: used chiefly for refrigeration and in the manufacture of commercial chemicals and laboratory reagents.
2. Also called ammonia solution, ammonia water, aqua ammoniae, aqua ammonia, aqueous ammonia . this gas dissolved in water; ammonium hydroxide.
[ 1790-1800; ammoniac. See AMMONIAC ]