| Noun | 1. | cell death - (physiology) the normal degeneration and death of living cells (as in various epithelial cells) physiology - the branch of the biological sciences dealing with the functioning of organisms death - the permanent end of all life functions in an organism or part of an organism; "the animal died a painful death" apoptosis, caspase-mediated cell death, programmed cell death - a type of cell death in which the cell uses specialized cellular machinery to kill itself; a cell suicide mechanism that enables metazoans to control cell number and eliminate cells that threaten the animal's survival |