Botany. a fleshy, usually oblong or rounded thickening or outgrowth, as the potato, of a subterranean stem or shoot, bearing minute scalelike leaves with buds or eyes in their axils from which new plants may arise.
Anatomy. a rounded swelling or protuberance; a tuberosity; a tubercle.
tuber [%PREMIUM_LINK%] (t'bər) Pronunciation Key
The thickened part of an underground stem of a plant, such as the potato, bearing buds from which new plant shoots arise. Compare bulb, corm, rhizome, runner.