- yam - edible tuber of any of several yams
--1 is a kind of tuber
--1 is a part of yam, yam plant- yam, yam plant - any of a number of tropical vines of the genus Dioscorea many having edible tuberous roots
--2 is a kind of vine
--2 is a member of Dioscorea, genus Dioscorea
--2 has parts: yam
--2 has particulars:white yam, water yam, Dioscorea alata; cinnamon vine, Chinese yam, Dioscorea batata; air potato, Dioscorea bulbifera; cush-cush, Dioscorea trifida - yam - sweet potato with deep orange flesh that remains moist when baked
--3 is a kind of sweet potato
- yam - edible tuberous root of various yam plants of the genus Dioscorea grown in the tropics world-wide for food
--4 is a kind of root vegetable
- yam, yam plant - any of a number of tropical vines of the genus Dioscorea many having edible tuberous roots