sweet potato

1 :  a tropical vine (Ipomoea batatas) of the morning-glory family that is often grown for its edible tuberous root or for its ornamental variously shaped green to purple leaves and usually white to pinkish funnel-shaped flowers with pink to purple centers; also :  the large thick sweet and nutritious tuberous root of the sweet potato that has beige, yellow, orange, red, or purple flesh and is cooked and eaten as a vegetable — compare yam 2

2 :  ocarina