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1. Any of various mixtures of herbs such as ground ivy, yarrow, or sweet gale, formerly used in brewing for their flavor, aroma, or preservative qualities.
2. A beer brewed with such a mixture.
[Dutch, from Middle Dutch gruit, grute, from Old Low Franconian grūt, perhaps originally referring to a mixture of malt and herbs used at the beginning of the medieval brewing process and akin to Old English grūt, coarse meal, hulled grain.]