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am·mo·ni·ac2  (  -m   n  -  k  ) KEY NOUN: - A strong-smelling gum resin from the stems of a plant (Dorema ammoniacum) of western Asia, formerly used in perfumery and in medicine as an expectorant and a stimulant.
Also called
gum ammoniac.
ETYMOLOGY:Middle English ammoniak, from Latin amm niacum, from Amm niacus, of Amen, from Greek Amm niakos ; see ammonia
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