prickly-ash

prick ly-ash ▶noun a spiny North American shrub or tree with prickly branches and bark that can be used medicinally. [Genus Zanthoxylum, family Rutaceae: the northern prickly-ash (Z. americanum ) (also called toothache tree ), and the southern prickly-ash (see Hercules-club ). ] • a medicinal preparation of the bark of these trees.