Yam - Definition
yam
n 1: edible tuber of any of several yams
2: any of a number of tropical vines of the genus Dioscorea many
having edible tuberous roots [syn: yam, yam plant]
3: sweet potato with deep orange flesh that remains moist when
baked
4: edible tuberous root of various yam plants of the genus
Dioscorea grown in the tropics world-wide for food