toothache tree

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An aromatic, spiny North American shrub or tree (Zanthoxylum americanum) whose dried bark has medicinal uses.

from The Century Dictionary.

• noun The prickly-ash.
• noun The somewhat similar Aralia spinosa, or angelica-tree, sometimes called wild orange.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun small deciduous aromatic shrub (or tree) having spiny branches and yellowish flowers; eastern North America