Holy Grail
WordNet
noun
(1) (legend) chalice used by Christ at the last supper
WiktionaryText
Proper noun
the Holy Grail
- An artifact in Christian mythology, being the dish used by Christ at the Last Supper and in which some of his blood was caught during the Crucifixion.
Noun
holy grail (plural holy grails)
- A distant, all-but-unobtainable ultimate goal of a person or organization.
- A difficult or near-impossible goal that would prove to be a major benefit (example: "nanotechnology is the holy grail of medicine")