Definition of devil tree in US English:

devil tree

noun

  • A broadleaved evergreen tree of the Old World tropics, Alstonia scholaris (family Apocynaceae), having bitter-tasting bark used in traditional and homeopathic medicine; also called dita, milkwood.

Origin

Mid 19th century; earliest use found in John Lindley (1799–1865), botanist and horticulturist.