1 [too-ber, tyoo-]
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.

1660–70; < Latin tūber bump, swelling. Cf. truffle

tuberless, adjective
tuberoid, adjective Unabridged


2 [too-ber, tyoo-]
a person or thing that forms, installs, or operates with tubes.
Also called inner-tuber. a person who participates in the sport of tubing.

1920–25; tube + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tuber (ˈtjuːbə)
1.  a fleshy underground stem (as in the potato) or root (as in the dahlia) that is an organ of vegetative reproduction and food storage
2.  anatomy a raised area; swelling
[C17: from Latin tūber hump]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"thick underground stem," 1668, from L. tuber "lump, bump," perhaps related to tumere "to swell" (see thigh).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

tuber tu·ber (tōō'bər, tyōō'-)
n. pl. tubers or tu·ber·a (-bər-ə)
A localized rounded projection or swelling; a knob, tuberosity, or eminence.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
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.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
These days they usually use cornstarch, sometimes tuber starch.
Effects of pre-plant and in-season nitrogen management practices on tuber yield and quality of two potato cultivars.
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