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tumour

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noun [countable] tumour pronunciation in British English /ˈtjuːmə(r)/ 
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singulartumour
pluraltumours
  1. a mass of cells in your body that grow in a way that is not normal. A benign tumour is harmless, and a malignant tumour can cause death

    She died of a brain tumour.

    an operation to remove the tumour

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