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Gruel \Gru"el\, n. [OF. gruel, F. gruau; of German origin; cf. OHG. gruzzi groats, G. gr["u]tze, As. grut. See {Grout}.] A light, liquid food, made by boiling meal of maize, oatmeal, or fiour in water or milk; thin porridge.
gruel n : a thin porridge (usually oatmeal or cornmeal)