A tumor or tumour is the name for a swelling or lesion formed by an abnormal growth of cells (termed neoplastic) which may be benign or malignant.

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Alternative Names Mass; Neoplasm. Definition Return to top. A tumor is an abnormal growth of body tissue. Tumors can be cancerous (malignant) or non-cancerous (benign).

noun. a swelling on some part of the body; a mass of new tissue growth independent of its surrounding structures, having no physiological function; neoplasm: such tumors are ...

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