dragon's blood

a deep-red, water-insoluble resin exuding from the fruit of a palm, Daemonorops draco, of the Malay Archipelago, used chiefly in the preparation of varnishes and in photoengraving for protecting certain areas of the metal plate from the acid.

any of various similar resins from other trees.

a red resinous substance obtained from the fruit of a Malaysian palm, Daemonorops (or Calamus) draco: formerly used medicinally and now used in varnishes and lacquers

any of several similar resins obtained from other trees, esp from the dragon tree and a related species, Dracaena cinnabari (Socotra dragon's blood dracaena)