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English definition of “the holy grail”

the holy grail

noun [S]     /ˌhəʊ.liˈɡreɪl/ US  /ˌhoʊ-/
(also the Holy Grail) a cup believed to have been used by Jesus Christ at the meal before his death Religious objects something that is extremely difficult to find or get: Sustained nuclear fusion is the holy grail of the power industry .Complicated and difficult to doDifficult to understand
(Definition of the holy grail noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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