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English definition of “the holy grail”

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the holy grail

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