Definition of grail

Definition of grail
  1. grail Noun The Holy Grail.
  2. grail Noun The object of an extended or difficult quest.[http://www.merriam-webster.com/dictionary/grail]
  3. grail Noun GRAIL mission, an acronym for "Gravity Recovery and Interior Laboratory", a pair of NASA spacecraft sent to the moon to measure its gravity field.
  4. grail Noun A book of offices in the Roman Catholic Church; a gradual.
  5. grail Noun Small particles of earth; gravel.
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