hypoplasia /hī′pōplā″zhə/ [Gk, hypo + plassein, to mold] , underdevelopment of an organ or a tissue, usually resulting from the presence of a smaller-than-normal number of cells. Also called hypoplasty. Compare aplasia, hyperplasia. Kinds include cartilage-hair hypoplasia, enamel hypoplasia. See also oligomeganephronia, osteogenesis imperfecta. −hypoplastic, adj.
