'Toothache tree' definitions:

Definition of 'toothache tree'

From: WordNet
noun
Small deciduous aromatic shrub (or tree) having spiny branches and yellowish flowers; eastern North America [syn: toothache tree, sea ash, Zanthoxylum americanum, Zanthoxylum fraxineum]

Definition of 'Toothache tree'

From: GCIDE
  • 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]

Definition of 'toothache tree'

From: GCIDE