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From The Collaborative International Dictionary of English v.0.48:
Gruel \Gru"el\, n. [OF. gruel, F. gruau; of German origin; cf. OHG. gruzzi groats, G. gr["u]tze, As. gr[=u]t. See Grout.] A light, liquid food, made by boiling meal of maize, oatmeal, or flour in water or milk; thin porridge. [1913 Webster] grueling