toothache tree n 1: small deciduous aromatic shrub (or tree) having spiny branches and yellowish flowers; eastern North America [syn: {toothache tree}, {sea ash}, {Zanthoxylum americanum}, {Zanthoxylum fraxineum}]
Prickly ash \Prickly ash\ (Bot.), 1. A prickly shrub ({Xanthoxylum Americanum}) with yellowish flowers appearing with the leaves; also called {toothache tree}. All parts of the plant are pungent and aromatic. The southern species is {Xanthoxylum Carolinianum}. --Gray. [1913 Webster] 2. (Bot.), {Hercules'-club}, also called the {Angelica tree}. [PJC]
Toothache \Tooth"ache`\, n. (Med.) Pain in a tooth or in the teeth; odontalgia. [1913 Webster] {Toothache grass} (Bot.), a kind of grass ({Ctenium Americanum}) having a very pungent taste. {Toothache tree}. (Bot.) (a) The prickly ash. (b) A shrub of the genus {Aralia} ({Aralia spinosa}). [1913 Webster]