Construction is a general term meaning the art and science to form objects, systems, or organizations, and comes from Latin constructionem (from com-together and struere to pile up) and Old French construction. Construction is used as a verb: the act of building, and a noun: how a building was built, the nature of its structure.
Definition of Placenta accreta. Placenta accreta: The abnormal adherence of the chorion of the placenta to the myometrium of the uterus. Normally there is tissue intervening between the chorionic villi and the myometrium, but in 'placenta accreta, the vascular processes of the chorion grow directly in the myometrium. Placenta accreta can progress into placenta percreta. Search MedTerms:
placenta. 1  Anatomy, Zoology. the organ in most mammals, formed in the lining of the uterus by the union of the uterine mucous membrane with the membranes of the fetus, that provides for the nourishment of the fetus and the elimination of its waste products. 2  Botany. the part of the ovary of flowering plants that bears the ovules.