involution medical definition

1. A decrease in size of an organ, as of the uterus following childbirth.
2. The ingrowth and curling inward of a group of cells, as in the formation of a gastrula from a blastula.
3. A progressive decline or degeneration of normal physiological functioning occurring as a result of the aging process. Also called catagenesis.

Related Forms:

• involutional adjective