n 1 a : an inward curvature or penetration b : the formation of a gastrula by ingrowth of cells formed at the dorsal lip 2 : a shrinking or return to a former size < 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 .
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 .
