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.