- 1 [uncountable, countable] a serious disease in which growths of cells, also called cancers, form in the body and kill normal body cells. The disease often causes death lung/breast cancer cancer of the colon/stomach Most skin cancers are completely curable. The cancer has spread to his stomach. Smokers face an increased risk of developing lung cancer. cancer patients cancer research
- 2[countable] (literary) an evil or dangerous thing that spreads quickly Violence is a cancer in our society.
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NAmE//ˈkænsərəs//adjective to become cancerous cancerous cells/growths/tumors