Definition of tumour noun from the Oxford Advanced Learner's Dictionary



(especially US English tumor) noun
BrE BrE//ˈtjuːmə(r)//
; NAmE NAmE//ˈtuːmər//
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a mass of cells growing in or on a part of the body where they should not, usually causing medical problems a brain tumour a benign/malignant (= harmless/harmful)tumour Word Originlate Middle English: from Latin tumor, from tumere ‘to swell’.Extra examples He developed a brain tumour. a malignant tumour on the eyelid a primary tumour in the breast He has a malignant brain tumour. They were relieved to hear that the tumour was benign.