Involution

The retrogre ive change to their normal condition that certain organs undergo after fulfilling their functional purposes. I. of the Uterus, the return of the uterus, which after gestation weighs about two pounds, to its normal weight and condition. I.forms, a term applied to microorganisms that deviate from a type, or undergo degenerative changes, probably as a result of nutritive variation. They are free in filaments, flat layers, or cube-like packets.