- yam, yam plant - any of a number of tropical vines of the genus Dioscorea many having edible tuberous roots
--1 is a kind of vine
--1 is a member of Dioscorea, genus Dioscorea
--1 has parts: yam
--1 has particulars:white yam, water yam, Dioscorea alata; cinnamon vine, Chinese yam, Dioscorea batata; air potato, Dioscorea bulbifera; cush-cush, Dioscorea trifida