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Grain, in agriculture, the dry seedlike fruit of a cereal grass; also, the plant that bears these fruits, including wheat, rice, oats, millet, maize, and rye. The main dietary staple of both humans and domesticated animals, grain, whole and ground, is primarily a source of carbohydrates, though some protein, vitamins, and other nutrients are present. Half of the world's cropland grows grain (corn, wheat, and rice).

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Ghibellines to Grand Prix