yam (n.)edible tuber of any of several yams;
yam (n.)any of a number of tropical vines of the genus Dioscorea many having edible tuberous roots;
Synonyms: yam plant
yam (n.)sweet potato with deep orange flesh that remains moist when baked;
yam (n.)edible tuberous root of various yam plants of the genus Dioscorea grown in the tropics world-wide for food;