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Holy Grail

or holy grail

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noun
  1. grail(def 1).
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Origin of Holy Grail

First recorded in 1580–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for holy grail

Holy Grail

noun
    1. 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
    2. (in modern spirituality) a symbol of the spiritual wholeness that leads a person to union with the divine
  1. informal any desired ambition or goalthe Holy Grail of infrared astronomy
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Word Origin

C14 grail from Old French graal, from Medieval Latin gradālis bowl, of unknown origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012