Meaning of “the holy grail” in the English Dictionary

american-english dictionary

"the holy grail" in British English

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the holy grailnoun [ S ]

uk /ˌhəʊ.li ˈɡreɪl/ us /ˌhoʊ.li ˈɡreɪl/

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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"Holy Grail" in American English

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Holy Grailnoun [ C ]

also holy grail us /ˈhoʊ·li ˈɡreɪl/

something that a person or a particular group of people want very much to have or achieve:

Earth-like planets - the holy grail of planet hunting - are too small to detect.

The Holy Grail is also the cup Jesus was believed to have drunk from during his last meal with his disciples.

(Definition of “Holy Grail” from the Cambridge Academic Content Dictionary © Cambridge University Press)