noun
1. : any of several resinous mostly dark red substances derived from various trees ; specifically : the resin from the fruit of several palms of the genus Daemonorops (especially D. draco ) that yields the true dragon's blood of commerce which is used for coloring varnish and in photoengraving for preventing undercutting of the printing surface during etching
2. : the thickened juice of the dragon tree of the Canary islands or a related tree of Socotra
3. : a synthetic powder used in photoengraving similarly to true dragon's blood
4. or dragon's-blood red : pompeian red