The removal and examination of a sample of tissue, cells, or bodily fluid from a living body for diagnostic purposes.
To take a sample (a biopsy) for pathological examination.
The removal of something (a tumor or body part) by cutting.
The removal of some text during editing.
The removal of a gene from a section of genetic material.
The fact that, under certain hypotheses, the homology of a space relative to a subspace is unchanged by the identification of a subspace of the latter to a point.