Definition - Yam

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Yam

edible tuberous root of various yam plants of the genus Dioscorea grown in the tropics world-wide for food
sweet potato with deep orange flesh that remains moist when baked
any of a number of tropical vines of the genus Dioscorea many having edible tuberous roots
edible tuber of any of several yams
Any one of several cultural varieties of the sweet potato.