Dictionary
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.