pockwood
/ˈpɒkwʊd/Now chiefly Jamaican
noun
The wood of the tree Guaiacum officinale, formerly used medicinally, especially for the treatment of syphilis. Also (more fully pockwood tree): the tree itself.
Origin
Late 16th century. From pock + wood, so called on account of the plant's medicinal use against syphilis.