biopsy -
To take a sample a biopsy for pathological examination.
Wikipedia
A biopsy is a medical test involving the removal of cells or tissues for examination. It is the medical removal of tissue from a living subject to determine the presence or extent of a disease. The tissue is generally examined under a microscope by a pathologist, and can also be analyzed chemically.
OmegaWiki Dictionary
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biopsy The surgical removal and examination of an organ or tissue to aid in diagnosis and treatment of a health condition.