• synonyms


[too-mer, tyoo-]
See more synonyms for tumor on Thesaurus.com
  1. a swollen part; swelling; protuberance.
  2. an uncontrolled, abnormal, circumscribed growth of cells in any animal or plant tissue; neoplasm.
  3. Archaic.
    1. inflated pride; haughtiness.
    2. pompous language; bombast.
Show More
Also especially British, tu·mour.

Origin of tumor

1535–45; < Latin: a swelling, swollen state, equivalent to tum(ēre) to swell + -or -or1
Related formstu·mor·like, adjectivetu·mor·ous, tu·mor·al, adjectivean·ti·tu·mor, adjective, nounan·ti·tu·mor·al, adjectivenon·tu·mor·ous, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for tumorous

Historical Examples

  • He made up his mind that a tumorous growth on the brain was responsible for the present state of the victim.

    Those Times And These

    Irvin S. Cobb

  • At this period a woman indicates a tendency towards obesity or tumorous growths.

Word Origin and History for tumorous



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

Show More
Online Etymology Dictionary, © 2010 Douglas Harper

tumorous in Medicine


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

tumorous in Science


  1. See neoplasm. See Note at cancer.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

tumorous in Culture


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.

Show More
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.