Definition of tumour in English:


(US tumor)


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

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