- A retrograde change. After treatment, a tumor may involute. With advancing age, there may be physical and emotional involution.
* * *1. Return of an enlarged organ to normal size. 2. Turning inward of the edges of a part. 3. In psychiatry, mental decline associated with advanced age. SYN: catagenesis. [L. in-volvo, pp. -volutus, to roll up]- i. of the uterus the process of reduction of the uterus to its normal nonpregnant size and state following childbirth.
* * *in·vo·lu·tion .in-və-'lü-shən n1 a) an inward curvature or penetrationb) the formation of a gastrula by ingrowth of cells formed at the dorsal lip2) a shrinking or return to a former size <\involution of the uterus after pregnancy>3) the regressive alterations of a body or its parts characteristic of the aging process specif decline marked by a decrease of bodily vigor and in women by menopause
* * *n.1. the shrinking of the womb to its normal size after childbirth.2. atrophy of an organ in old age.
* * *in·vo·lu·tion (in″vo-looґshən) [L. involutio; in into + volvere to roll] 1. a rolling or turning inward. 2. a retrograde change of the entire body or in a particular organ, as the retrograde changes in the female genital organs that result in normal size after delivery. 3. the progressive degeneration occurring naturally with advancing age, resulting in a reduction in size or function of organs or tissues.
Medical dictionary. 2011.