Pronunciation: (tOO'bur, tyOO'-),[key] —n. 1. Bot.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.
2. Anat.a rounded swelling or protuberance; a tuberosity; a tubercle.
Pronunciation: (tOO'bur, tyOO'-),[key] —n. 1. a person or thing that forms, installs, or operates with tubes.
2. Also called inner-tuber. a person who participates in the sport of tubing.