/ greɪl; NAmE / (also the ˌHoly ˈGrail ) noun
1.
[ sing. ] the cup or bowl believed to have been used by Jesus Christ before he died, that became a holy thing that people wanted to find
2.
[ C ] a thing that you try very hard to find or achieve, but never will
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WORD ORIGIN
from Old French graal , from medieval Latin gradalis dish.