Holy Grail

Translations
Святой Грааль
Finding a cure for cancer is the Holy Grail of medical research.
Найти лекарство от рака — это Святой Грааль медицинских исследований.
Definitions
The 'Holy Grail' originally refers to the legendary cup or vessel used by Jesus at the Last Supper and sought after in medieval literature as an object of great significance and miraculous powers. In modern usage, it describes something highly sought after, valuable, or difficult to attain.
Words
grail

noun
грааль
grails

noun
граали
holy

adjective
святой