The Holy Grail. / Something eagerly sought or quested for.

A book of offices in the Roman Catholic Church; a gradual.

(poetic) Small particles of earth; gravel.

One of the small feathers of a hawk.

plural of grail

(space science, NASA) Initialism of Gravity Recovery and Interior Laboratory.

plural of graile

Obsolete form of grail (“the Holy Grail”). / Obsolete form of grail (“book of offices in the Roman Catholic Church”).

(Arthurian legend) An artifact in Arthurian mythology, being the cup used by Christ at the Last Supper and in which some of his blood was caught during the crucifixion.

(figuratively) Anything that is highly sought-after but attained only through difficult endeavor.