Tumor definition

to͝omər, tyo͝o-
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An abnormal growth of tissue resulting from uncontrolled, progressive multiplication of cells and serving no physiological function; a neoplasm.
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A swollen part; a swelling.

A plant tumor.

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(obs.) High-flown language; bombast.
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A swelling on some part of the body.
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A mass of new tissue growth independent of its surrounding structures, having no physiological function; neoplasm: such tumors are classified as benign or malignant.
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An abnormal growth of tissue resulting from uncontrolled, progressive multiplication of cells and serving no physiological function; a neoplasm.
noun
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A swollen part; a swelling.

A plant tumor.

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(oncology, pathology) An abnormal growth; differential diagnosis includes abscess, metaplasia, and neoplasia.
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Other Word Forms

Noun

Singular:
tumor
Plural:
tumors

Origin of tumor

  • Middle English tumour from Latin tumor from tumēre to swell teuə- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Old French tumour, from Latin tumor (“swelling"), from tumeō (“I bulge, swell"). English usage attested since the 16th century.

    From Wiktionary