Any swelling or morbid enlargement. The term now usually denotes neoplasm, a non-inflammatory mass formed by the growth of new cells in the body and having no physiological function. An innocent tumour is encapsulated and usually solitary, pressing upon, but not invading, adjacent tissues; a malignant tumour carcinoma, sarcoma invades tissues, tends to recur and spreads to other parts of the body. US tumor.
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