ammonia /(ăm*mō"nĭ*ȧ)/

am·mo·ni·a

ammonia

n.
  1. A gaseous compound of hydrogen and nitrogen, NH3, with a pungent smell and taste: -- often called volatile alkali, and spirits of hartshorn. It is very soluble in water, forming a moderately alkaline solution, and is used in aqueous solution as a household cleaning agent, such as for cleaning grease from glass. (Chem.)