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[C or U] (plural trout or trouts) a fish that is a popular food, especially a brown type that lives in rivers and lakes or a silver type that lives in the sea but returns to rivers to reproduceThousands of young salmon and trout have been killed by the pollution.
Loch Leven is famous for its trout fishing.
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[U] the flesh of this fish eaten as foodI love smoked trout, don't you?