Mastich, a resinous substance exuding from the mastich-tree, or Pistacia lentiscus, L. a native of the southern parts of Europe. The best is imported from Chios, in the Levant, in small transparent grains, of a yellowish colour, and an agreeable smell, when heated over the fire.

This resin is recommended in obstinate coughs ; dysenteries ; weakness of the stomach ; and in all cases of debility and laxity of the fibres. For such purposes, it is dissolved in rectified spirit of wine, and may be taken in doses of thirty or forty drops diluted with water, every three hours, or oftcner.