Gum ammoniac is a resinous substance derived from the stems of certain plants, known for its strong odor and medicinal properties. However, it also has synonyms that can be used to describe its various qualities and uses. These include Omphacite, Sal Ammoniac, Ammoniacal resin, Bitter gum, and Gum anime. Omphacite describes the greenish tint of the gum ammoniac, Sal Ammoniac refers to its use in the manufacture of ammonium chloride, and Ammoniacal resin and Gum anime both describe the use of the gum in producing varnishes and paints. The term Bitter gum is derived from the bitterness of the resin and its use as an expectorant in traditional medicine.