normoblast /nôr″məblast/ [L, norma + Gk, blastos, germ] , nucleated bone marrow red blood cell precursor. Developmental stages include the pronormoblast, the basophilic normoblast, the polychromatophilic normoblast, and the orthochromic normoblast. After the extrusion of the nucleus of the normoblast, the young erythrocyte becomes known as a reticulocyte and enters the circulating blood. Compare erythrocyte. See also reticulocyte.
