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
2.
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)
dragon's blood in American English
any of several red, resinous substances obtained from various tropical plants and trees, esp. a Malaysian palm tree (Daemonorops draco), and used for coloring varnishes and in photoengraving