grail¹ or (archaic) graal or grayle /grāl/

1. (often holy grail or Holy Grail) in medieval legend, the platter (sometimes supposed to be a cup) used by Christ at the Last Supper, in which Joseph of Arimathaea caught his blood at the Cross, said to have been brought by Joseph to Glastonbury, and the object of quests by King Arthur's Knights
2. A cherished ambition or goal

grail³ /grāl/ (poetic)

Gravel

• primary process
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• primed