n. [ From sal ammoniac, which was first obtaining near the temple of Jupiter Ammon, by burning camel's dung. See Ammoniac. ] (Chem.) 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. [ 1913 Webster + PJC ]
{ } a. Of, pertaining, or containing ammonia, or possessing its properties; as, an ammoniac salt; ammoniacal gas. [ 1913 Webster ]
Ammoniacal engine, an engine in which the vapor of ammonia is used as the motive force. -- Sal ammoniac [ L. sal ammoniacus ], the salt usually called chloride of ammonium, and formerly muriate of ammonia. [ 1913 Webster ]
. Any fermentation process by which ammonia is formed, as that by which urea is converted into ammonium carbonate when urine is exposed to the air. [ Webster 1913 Suppl. ]
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