GRAIL Meaning of GRAIL in English Grail /ɡreɪl/ BrE AmE noun [ Date: 1300-1400 ; Language: Old French ; Origin: grael , from Medieval Latin gradalis 'dish' ] ⇨ ↑ Holy Grail Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012