megaloblast

noun Pathology.

1. an abnormally large, immature, and dysfunctional red blood cell found in the blood of persons with pernicious anemia or certain other disorders.

noun

1. an abnormally large red blood cell precursor, present in certain types of anaemia

n.

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