- a brownish-yellow gum resin, having an acrid taste, occurring in tearlike fragments from a plant, Dorema ammoniacum, of western Asia: used in porcelain ceramics and in medicine as an expectorant and counterirritant.
Origin of gum ammoniac
Middle English word dating back to 1350–1400
Also called ammoniac, ammoniacum.
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- another name for ammoniac 2
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