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cancer

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cancer/ˈkænsɚ/noun
pluralcancers
cancer
/ˈkænsɚ/
noun
pluralcancers
Learner's definition of CANCER  
: a serious disease caused by cells that are not normal and that can spread to one or many parts of the body
[noncount]
[count]
— often used before another noun
[count]  : something bad or dangerous that causes other bad things to happen — usually singular
Cancer 
[noncount]  : the fourth sign of the zodiac that comes between Gemini and Leo and has a crab as its symbol
— see picture at zodiac
   b  [count]  : a person born under the sign of Cancer : a person born between June 22nd and July 22nd

— cancerous

/ˈkænsərəs/adjective
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