Wiktionary
n. (context legal English): archaic practice by which a person accused of a crime could prove his innocence by his survival of physically painful tests.
WordNet
n. a primitive method of determining a person's guilt or innocence by subjecting the accused person to dangerous or painful tests believed to be under divine control; escape was usually taken as a sign of innocence [syn: ordeal]
Wikipedia
' Trial by ordeal' was an ancient judicial practice by which the guilt or innocence of the accused was determined by subjecting them to an unpleasant, usually dangerous experience. Classically, the test was one of life or death and the proof of innocence was survival. In some cases, the accused was considered innocent if they escaped injury or if their injuries healed.
In medieval Europe, like trial by combat, trial by ordeal was considered a judicium Dei: a procedure based on the premise that God would help the innocent by performing a miracle on their behalf. The practice has much earlier roots, attested to as far back as the Code of Hammurabi and the Code of Ur-Nammu.
In pre-modern society, the ordeal typically ranked along with the oath and witness accounts as the central means by which to reach a judicial verdict. Indeed, the term ordeal, Old English ordĒ£l, has the meaning of "judgment, verdict" (German Urteil, Dutch oordeel), from Proto-Germanic *uzdailjam "that which is dealt out".
Priestly cooperation in trials by fire and water was forbidden by Pope Innocent III at the Fourth Lateran Council of 1215 and replaced by compurgation, later by inquisition. Trials by ordeal became rarer over the Late Middle Ages, but the practice was discontinued only in the 16th century.