1. A reference to the process of decay or death in tissues of the body; the gradual degeneration and death of a part through suspended or imperfect nutrition; an instance of this.
2. Characterized by the physiological or normal death of cells or tissues as a result of changes associated with development, aging, or use.
3. Relating to the gradual degeneration and death of a part as a result of malnutrition; necrosis.