Gum ammoniac

[Jessica]

The concrete juice (gum resin) of an umbelliferous
plant, the Dorema ammoniacum. It is brought chiefly from Persia in the
form of yellowish tears, which occur singly, or are aggregated into
masses. It has a peculiar smell, and a nauseous, sweet taste, followed
by a bitter one. It is inflammable, partially soluble in water and in
spirit of wine, and is used in medicine as an expectorant and
resolvent, and for the formation of certain plasters.