Definition of tumor in English:


(British tumour)


  • 1A swelling of a part of the body, generally without inflammation, caused by an abnormal growth of tissue, whether benign or malignant.

    • ‘One theory is that the rate at which tumor cells die is too slow to keep pace with the rapid growth and mutation of tumors in the body.’
    • ‘My wife had a bad experience, she had the most malignant of the brain tumours that can occur.’
    • ‘Malignant brain tumors can grow rapidly, crowding or destroying nearby brain tissue.’
    • ‘An appropriate strength sun block will minimise the risks of burning, with its associated risk of malignant tumours.’
    • ‘In the brain, both malignant and benign tumours can be harmful because they increase pressure in the skull.’
    • ‘Cancer happens when some of the cells multiply in an abnormal way, causing a growth called a tumour to form.’
    • ‘A benign glomus tumor surrounding a malignant area is found in about half of the cases.’
    • ‘Malignant brain tumors grow and spread into neighboring tissues rapidly.’
    • ‘The difference between malignant and benign tumours is that malignant tumours have the ability to invade surrounding areas.’
    • ‘Malignant tumors have the ability to transfer disease from organ to another.’
    • ‘Cancer of the throat can involve malignant tumors on the vocal cords, voice box, or other areas of the throat.’
    • ‘Malignant tumours are the real cancers and they behave quite differently from benign tumours.’
    • ‘Malignant tumors usually are associated with ascites and demonstrate rapid growth.’
    • ‘One of the commonest reasons for undertaking a biopsy is to establish whether a tumour is malignant or benign.’
    • ‘Given the slow growth of prostatic tumors, such a delay should not affect treatment outcomes.’
    • ‘Benign tumors called neurofibromas are found on or under the skin or along the nerves of the body.’
    • ‘These tumors can kill your body's healthy tissues and spread to other parts of your body.’
    • ‘The knee is the most common joint involved in both benign and malignant tumors.’
    • ‘It is important to remember that in a lot of cases tumours are benign (not cancerous).’
    • ‘Both benign and malignant tumors showed ulceration of the overlying mucosa.’
    cancerous growth, malignant growth, cancer, malignancy
    lump, growth, swelling
    carcinoma, sarcoma, melanoma, lymphoma, myeloma, neoplasm, metastasis, neurofibroma, teratoma, fibroadenoma, meningioma
    View synonyms
    1. 1.1archaic A swelling of any kind.


Late Middle English: from Latin tumor, from tumere to swell.