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A yam is an edible underground tuber, a starchy plant root that serves as a food source. It matters because yams are an important staple crop in many parts of the world, providing nutrition and sustenance to millions of people.
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White yam variety, Dioscorea rotundata in local monday market in Kaduna, Nigeria White yams at a retail market in Brixton, England, 2004
Yam is the common name for some plant species in the genus Dioscorea (family Dioscoreaceae) that form edible tubers (some other species in the genus being toxic).