immature erythrocyte [L, im + maturus, ripe; Gk, erythros, red, kytos, cell] , a nucleated precursor red blood cell in the erythrocyte series: pronormoblast, basophilic normoblast, polychromatophilic normoblast, or orthochromic normoblast. The orthochromic normoblast appears on peripheral blood films of newborns, in uncompensated hemolytic anemia, and in hematologic neoplasms.
