noun

1. a small, very spiny tree (Aralia spinosa) of the ginseng family, with clusters of small, white flowers, found in the E U.S.; devil's walking stick
2. a spiny tree or shrub (Zanthoxylum clava-herculis) of the rue family, native to the S U.S.; prickly ash

Etymology: in allusion to the club borne by Hercules