corn, in botany. The name corn is given to the leading cereal crop of any major region. In England corn means wheat; in Scotland and Ireland, oats. The grain called corn in the United States is Indian corn or maize ( Zea mays mays). The part of the United States where most of the corn is grown, including Ohio, Illinois, Indiana, Missouri, Kansas, Iowa, and Nebraska, is known as the Corn Belt.
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