yam

noun

1. 1

   edible tuberous root of various yam plants of the genus Dioscorea grown in the tropics world-wide for food

2. 2

   sweet potato with deep orange flesh that remains moist when baked

3. 3

   any of a number of tropical vines of the genus Dioscorea many having edible tuberous roots

4. 4

   edible tuber of any of several yams