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[too-mer, tyoo-] /ˈtu mər, ˈtyu-/
a swollen part; swelling; protuberance.
an uncontrolled, abnormal, circumscribed growth of cells in any animal or plant tissue; neoplasm.
  1. inflated pride; haughtiness.
  2. pompous language; bombast.
Also, especially British, tumour.
1535-45; < Latin: a swelling, swollen state, equivalent to tum(ēre) to swell + -or -or1
Related forms
tumorlike, adjective
tumorous, tumoral, adjective
antitumor, adjective, noun
antitumoral, adjective
nontumorous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for tumour
  • Anyone with a tumour would get treatment, and this is accepted.
  • As the vervain dries up in the smoke, so the tumour will also dry up and disappear.
  • My late father's brain tumour was difficult to manage.
  • The treatment works because a tumour cell is chemically different to a healthy cell.
  • Metastatic tumour cells-those which have spread from the site of the original tumour-migrate faster than other cells.
  • It provides a backstop that prevents a runaway cell line from reproducing indefinitely, and thus becoming a tumour.
  • And in future, tracking the glow may help reveal how cancer cells behave when a tumour starts spreading cancer around the body.
  • But he has not released a single medical bulletin, or even revealed the precise location of the tumour.
  • Once the rods were in place, the team fired a burst of laser light in the general location of the tumour.
  • Of chemotherapy to tumour sites without causing overwhelming systemic damage.
British Dictionary definitions for tumour


  1. any abnormal swelling
  2. a mass of tissue formed by a new growth of cells, normally independent of the surrounding structures
(obsolete) pompous style or language
Derived Forms
tumorous, tumoral, adjective
Word Origin
C16: from Latin, from tumēre to swell
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 tumour



1540s, from Latin tumor "swelling, condition of being swollen," from tumere "to swell" (see thigh).

Online Etymology Dictionary, © 2010 Douglas Harper
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tumour in Medicine

tumor tu·mor (tōō'mər, tyōō'-)

  1. An abnormal growth of tissue resulting from uncontrolled, progressive multiplication of cells and serving no physiological function; a neoplasm.

  2. A swollen part; a swelling.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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tumour in Science
See neoplasm. See Note at cancer.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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tumour in Culture

tumor definition

An abnormal mass of new tissue growth that serves no function in the body. Tumors are usually classified as benign or malignant and are often caused by cancer.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Slang definitions & phrases for tumour



The stomach: eliminating the protruding tummy

[1869+; fr a childish pronunciation of stomach]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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