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tuber1

[too-ber, tyoo-] /ˈtu bər, ˈtyu-/
noun
1.
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.
2.
Anatomy. a rounded swelling or protuberance; a tuberosity; a tubercle.
Origin
1660-1670
1660-70; < Latin tūber bump, swelling. Cf. truffle
Related forms
tuberless, adjective
tuberoid, adjective

tuber2

[too-ber, tyoo-] /ˈtu bər, ˈtyu-/
noun
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.
Origin
1920-25; tube + -er1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for tuber
  • 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.
British Dictionary definitions for tuber

tuber

/ˈtjuːbə/
noun
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
Word Origin
C17: from Latin tūber hump
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for tuber
n.

"thick underground stem," 1660s, from Latin tuber "lump, bump," perhaps related to tumere "to swell" (see thigh).

Online Etymology Dictionary, © 2010 Douglas Harper
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tuber in Medicine

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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tuber in Science
tuber
  (t'bər)   
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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7
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