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Holy Grail
First recorded in 1580-90
noun
1. a. Also called Grail, Sangraal. (in medieval legend) the bowl used by Jesus at the Last Supper. It was allegedly brought to Britain by Joseph of Arimathea, where it became the quest of many knights
b. (in modern spirituality) a symbol of the spiritual wholeness that leads a person to union with the divine
2. (informal) any desired ambition or goal: the Holy Grail of infrared astronomy
Word Origin
C14 grail from Old French graal, from Medieval Latin gradālis bowl, of unknown origin