megaloblast

An abnormally large nucleated red blood cell found especially in people having pernicious anemia or certain vitamin deficiencies.

A large nucleate cell found in the bone-marrow in the embryo: also a megalocyte, or large red blood-corpuscle occurring in certain forms of anemia in extra-uterine life.

An abnormally large red blood cell associated with pernicious anemia and with folic acid deficiency

abnormally large red blood cell present in pernicious anemia and folic acid deficiency