n. the earliest recognizable precursor of the red blood cell (erythrocyte). It is found in the bone marrow and has a large nucleus and a cytoplasm that stains deep blue with *Romanowsky stains. See also erythroblast; erythropoiesis.
n. any of a series of nucleated cells (see normoblast; proerythroblast) that pass through a succession of stages of maturation to form red blood cells (*erythrocytes). Erythroblasts are normally present in the blood-forming tissue of the bone marrow, but they may appear in the circulation in a variety of diseases (see erythroblastosis). See also erythropoiesis.... erythroblast
n. the process of red blood cell (*erythrocyte) production, which normally occurs in the blood-forming tissue of the *bone marrow. The ultimate precursor of the red cell is the *haemopoietic stem cell, but the earliest precursor that can be identified microscopically is the *proerythroblast. This divides and passes through a series of stages of maturation termed respectively early, intermediate, and late *normoblasts, the latter finally losing its nucleus to become a mature red cell. See also haemopoiesis.... erythropoiesis
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