• synonyms


[too-ber, tyoo-]
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  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.
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Origin of tuber1

1660–70; < Latin tūber bump, swelling. Cf. truffle
Related formstu·ber·less, adjectivetu·ber·oid, adjective


[too-ber, tyoo-]
  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.
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Origin of tuber2

First recorded in 1920–25; tube + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for tuber


  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
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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

Word Origin and History for tuber


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

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Online Etymology Dictionary, © 2010 Douglas Harper

tuber in Medicine


n. pl. tubers
  1. A localized rounded projection or swelling; a knob, tuberosity, or eminence.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

tuber in Science


  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.