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involution in·vo·lu·tion (ĭn'və-lōō'shən)
A decrease in size of an organ, as of the uterus following childbirth.
The ingrowth and curling inward of a group of cells, as in the formation of a gastrula from a blastula.
A progressive decline or degeneration of normal physiological functioning occurring as a result of the aging process. Also called catagenesis.
superinvolution su·per·in·vo·lu·tion (sōō'pər-ĭn'və-lōō'shən)
A reduction in the size of the uterus after childbirth to below its normal size. Also called hyperinvolution.