erythroblast

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erythroblast

 [ĕ-rith´ro-blast]
a term originally used for any type of nucleated erythrocyte, but now usually limited to one of the nucleated precursors of an erythrocyte, i.e. one of the developmental stages in the erythrocytic series, in contrast to a megaloblast. In this usage, it is called also normoblast.
basophilic erythroblast a nucleated precursor in the erythrocytic series, preceding the polychromatophilic erythroblast and following the proerythroblast; the cytoplasm is basophilic, the nucleus is large with clumped chromatin, and the nucleoli have disappeared. Called also basophilic normoblast.
orthochromatic erythroblast see normoblast.
polychromatic erythroblast (polychromatophilic erythroblast) see normoblast.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

e·ryth·ro·blast

(ĕ-rith'rō-blast),
Originally, a term denoting all forms of human red blood cells containing a nucleus, both pathologic (that is, megaloblastic) and normal (for example, normoblastic). The pathologic or megaloblastic series is observed in pernicious anemia in relapse. The term megaloblast is also used to indicate the first generation of cells in the red blood cell series that can be distinguished morphologically; hence, with this usage, megaloblast denotes both a normal and an abnormal cell. In the erythroblastic series of maturation four stages of development can be recognized: 1) proerythroblast, 2) basophilic erythroblast, 3) polychromatic erythroblast, and 4) orthochromatic erythroblast. In the megaloblastic series of maturation, stages similar to those found in the normoblastic series are seen: 1) promegaloblast, 2) basophilic megaloblast, 3) polychromatic megaloblast, and 4) orthochromatic megaloblast. In the normal series of maturation, after loss of the nucleus, young erythrocytes are called reticulocytes; these cells may be recognized with supravital stains such as brilliant cresyl blue; ultimately the reticulocytes become erythrocytes, or mature red blood cells.
Synonym(s): erythrocytoblast
[erythro- + G. blastos, germ]
Farlex Partner Medical Dictionary © Farlex 2012

erythroblast

(ĭ-rĭth′rə-blăst′)
n.
Any of the nucleated cells normally found only in bone marrow that develop into erythrocytes.

e·ryth′ro·blas′tic adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

e·ryth·ro·blast

(ĕ-rith'rō-blast)
The first generation of cells in the red blood cell series that can be distinguished from precursor endothelial cells. In normal maturation, four stages of development can be recognized: pronormoblast, basophilic normoblast, polychromatic normoblast, and orthochromatic normoblast.
[erythro- + G. blastos, germ]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

erythroblast

A primitive, nucleated red blood cell. A stage in the development of the normal non-nucleated red cell (ERYTHROCYTE) found in the circulating blood.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

erythroblast

a nucleated cell occurring in bone marrow as the first identifiable stage of red blood cell formation; See ERYTHROCYTE.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

Loevit,

Moritz, Austrian pathologist, 1851-1918.
Loevit cell - originally a term denoting all forms of human red blood cells containing a nucleus, both pathologic and normal. Synonym(s): erythroblast
Medical Eponyms © Farlex 2012

e·ryth·ro·blast

(ĕ-rith'rō-blast)
The first generation of cells in the red blood cell series that can be distinguished from precursor endothelial cells.
[erythro- + G. blastos, germ]
Medical Dictionary for the Dental Professions © Farlex 2012