gum ammoniac


noun

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.
Also called ammoniac, ammoniacum.

Origin of gum ammoniac

Middle English word dating back to 1350–1400

British Dictionary definitions for gum ammoniac

gum ammoniac

noun

another name for ammoniac 2