What does "ordeal" mean?

Ordeal: Any severe trial, or test; a painful experience. Ordeal bean. (Bot.) See Calabar bean, under Calabar. -- Ordeal root (Bot.) the root of a species of Strychnos growing in West Africa, used, like the ordeal bean, in trials for witchcraft. -- Ordeal tree (Bot.), a poisonous tree of Madagascar (Tanghinia, or Cerbera, venenata). Persons suspected of crime are forced to eat the seeds of the plumlike fruit, and criminals are put to death by being pricked with a lance dipped in the juice of the seeds.