\Tooth"ache`\, n. (Med.)
Pain in a tooth or in the teeth; odontalgia.
{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} ({A. spinosa}).