plural Holy Grails
1
or holy grail
: something that you want very much but that is very hard to get or achieve
Finding a cure for cancer is the holy grail of medical researchers.
2
: the cup that is said to have been used by Jesus Christ and that was sought by knights during the Middle Ages
Cite this Entry
“Holy Grail.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/Holy%20Grail. Accessed 21 Jun. 2026.
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