1. (Science: oncology) An abnormal mass of tissue that results from excessive cell division that is uncontrolled and progressive, also called a neoplasm. Tumours perform no useful body function. They may be either benign (not cancerous) or malignant.

2. Swelling, one of the cardinal signs of inflammations, morbid enlargement.

Origin: L. Tumere = to swell An abnormal new mass of tissue that serves no purpose.

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