Ordeal, a test by fire, water, poison, wager of battle, or the like, of the innocence or guilt of persons in appeal thereby to the judgment of God in default of other evidence, on the superstitious belief that by means of it God would interfere to acquit the innocent and condemn the guilty, a test very often had recourse to among savage or half-civilised nations.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Orcus * Ordericus Vitalis