*xanthoxylum*

‖n. [ NL., from Gr. xanqo`s yellow + xy`lon wood. ] (Bot.) A genus of prickly shrubs or small trees, the bark and rots of which are of a deep yellow color; prickly ash. [ 1913 Webster ]

☞ The commonest species in the Northern United States is Xanthoxylum Americanum. See Prickly ash, under Prickly. [ 1913 Webster ]