Tuber

n.	1.	(Bot.) A fleshy, rounded stem or root, usually containing starchy matter, as the potato or arrowroot; a thickened root-stock. See Illust. of Tuberous.
	2.	(Anat.) A tuberosity; a tubercle.

Noun	1.	tuber - a fleshy underground stem or root serving for reproductive and food storage
	2.	Tuber - type genus of the Tuberaceae: fungi whose fruiting bodies are typically truffles Synonyms: genus Tuber

groundnut, Jerusalem artichoke, potato bean, stalk, stem, sweet potato, water chestnut, wild bean, yam