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[too-ber, tyoo-] /ˈtu bər, ˈtyu-/
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.
Origin of tuber1
1660-70; < Latin tūber bump, swelling. Cf. truffle
Related forms
tuberless, adjective
tuberoid, adjective


[too-ber, tyoo-] /ˈtu bər, ˈtyu-/
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. 2015.
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Examples from the Web for tuber
Contemporary Examples
  • I feel like they are the alchemist of the tuber world; they make everything from smooth, soft purees to beautiful crunchy pickles.

    Fresh Picks Eli Kirshtein February 22, 2010
Historical Examples
  • From the leaf, inserted half its length in the soil (or sometimes only the petiole inserted) a tuber arises.

  • It is found in the tuber of the dahlia, in the dandelion, and some other plants.

  • The enclosed shoot develops into a tuber which stands more or less vertical, and the scales become pretty little leaves.

  • All of these may be grown from seed or by division of the tuber before planting.

    The Book of Bulbs Samuel Arnott
  • The block itself is the tuber of a sort of yam, which grows above ground instead of below.

    Omphalos Philip Henry Gosse
  • Chemically and physically these cells are just the same as the cells in the interior of the tuber.

    Parallel Paths Thomas William Rolleston
  • In early spring these eyes send out tubers, and every tuber will make a new vine when planted.

    The Woodcraft Girls at Camp Lillian Elizabeth Roy
  • A second crop of flowers need not be expected from a tuber that has borne one crop.

    ABC of Gardening Eben Eugene Rexford
  • The tuber is cut into pieces, or runners from old plants are stuck into the ground, and the planting is complete.

    The Tinguian Fay-Cooper Cole
British Dictionary definitions for tuber


a fleshy underground stem (as in the potato) or root (as in the dahlia) that is an organ of vegetative reproduction and food storage
(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

"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
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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