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tumour |
Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson | 0.02 sec. |
tumouror neoplasmMass of abnormal tissue that arises from normal cells, has no useful function, and tends to grow. Cell abnormalities may include increased size or number or loss of characteristics that differentiate their tissue of origin. Cells in malignant tumours (see cancer) have a distorted size, shape, and/or structure. Less differentiated cells tend to grow faster. Malignant tumours invade tissues locally and spread (metastasize) in blood or lymph: the stronger the tendency to metastasize, the more malignant the tumour. Tumours may not cause pain until they press on or invade nerves. Both benign and malignant tumours can press on nearby structures, block vessels, or produce excess hormones, all of which can cause death. Benign tumours remain as a solid mass that can be removed by surgery if accessible; they can consist of various tissues and may become malignant; malignant tumours, though they may remain quiescent for a time, never become benign. tumour (US), tumor Pathol a. any abnormal swelling b. a mass of tissue formed by a new growth of cells, normally independent of the surrounding structures How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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When the fourteen years which Nature permits Are closing in asthma, or tumour, or fits, And the vet's unspoken prescription runs To lethal chambers or loaded guns, Then you will find--it's your own affair But . "Now, as regards this swelling," he was saying, as he began a belated and distant examination of Kwaque's affliction, "I should say, at a glance, that it is neither tumour nor cancer, nor is it even a boil. A cancer, a tumour, or something of that nature,--a thing that devours and destroys. |
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