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.

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


  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.

  1. See neoplasm. See Note at cancer.

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.

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