Seems this is becoming a linguistic definition contest across continents. If it helps... YAM From the Merriam-Webster: Etymology: earlier iname, from Portuguese inhame & Spanish ñame, of African origin; akin to Fulani nyami to eat 1 : the edible starchy tuberous root of various plants (genus Dioscorea of the family Dioscoreaceae) used as a staple food in tropical areas; also : a plant producing yams 2 : a moist-fleshed and usually orange-fleshed sweet potato From various web resources: A large tuber that grows in tropical and subtropical climates; it has starchy, pale-yellow flesh. The name yam is also given to the (botanically unrelated) sweet potato. There are over 150 species of yams grown throughout the world. Most of "yams" sold in the US, however, are actually sweet potatoes. Yams are higher in sugar that sweet potatoes. Used in soups and stews, mashed, and fried. Finally, I thought the following webpage made yams rather unappetizing, but, your views? Chinese Yam