Medical Definition of cytology
1a: a branch of biology dealing with the structure, function, multiplication, pathology, and life history of cells : cell biologyb: the cellular aspects of a phenomenon, process, or structure <the cytology of cancer> <liver cytology>
2: the microscopic examination of cells obtained from the body (as by aspiration or scraping) for diagnostic purposes : exfoliative cytology <A Mayo study found that cytology is only 40 percent sensitive in detecting bladder cancer among people who have the disease.—Mayo Clinic Health Letter, September 1999>—called also
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