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gum' ammo'niac

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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

gumgum arabic
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