In biology, lysis refers to the breakdown of a cell caused by damage to its plasma (outer) membrane. Lysis can be caused by chemical or physical means (for example, strong detergents or high-energy sound waves) or by an infection. www.stjude.org/glossary
The breaking open of a cell by the destruction of its wall or membrane. The rupture and death of a bacterial cell upon the release of phage progeny. helios.bto.ed.ac.uk/bto/glossary/lm.htm