Source : Webster's Revised Unabridged Dictionary (1913)

Cow tree \Cow" tree`\ (kou" tr?`). [Cf. SP. palo de vaca.]
   (Bot.)
   A tree ({Galactodendron utile} or {Brosimum Galactodendron})
   of South America, which yields, on incision, a nourishing
   fluid, resembling milk.