( usually initial capital letter ) Also called Holy Grail. a cup or chalice that in medieval legend was associated with unusual powers, esp. the regeneration of life and, later, Christian purity, and was much sought after by medieval knights

identified with the cup used at the Last Supper and given to Joseph of Arimathea.

( sometimes initial capital letter ) Informal . any greatly desired and sought-after objective; ultimate ideal or reward.

noun

holy dish , chalice , cup