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Wordnet 3.0

NOUN (4)

1. edible tuber of any of several yams;

2. any of a number of tropical vines of the genus Dioscorea many having edible tuberous roots;
[syn: yam, yam plant]

3. sweet potato with deep orange flesh that remains moist when baked;

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

The Collaborative International Dictionary of English v.0.48:

Yam \Yam\ (y[a^]m), n. [Pg. inhame, probably from some native name.] 1. (Bot.) A large, esculent, farinaceous tuber of various climbing plants of the genus Dioscorea; also, the plants themselves. Mostly natives of warm climates. The plants have netted-veined, petioled leaves, and pods with three broad wings. The commonest species is Dioscorea sativa, but several others are cultivated. [1913 Webster] 2. (Bot.) Any one of several cultural varieties of the sweet potato. [U. S.] [Webster 1913 Suppl.] Chinese yam, a plant (Dioscorea Batatas) with a long and slender tuber, hardier than most of the other species. Wild yam. (a) A common plant (Dioscorea villosa) of the Eastern United States, having a hard and knotty rootstock. (b) An orchidaceous plant (Gastrodia sesamoides) of Australia and Tasmania. [1913 Webster]