Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to rubricyte: prorubricyte, polychromatophilic


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.


Polychromatic normoblast. See: erythroblast.
[L. ruber, red, + kytos, cell]


/ru·bri·cyte/ (roo´brĭ-sīt) polychromatophilic erythroblast.


Etymology: L, ruber, red; Gk, kytos, cell
a nucleated red blood cell; the marrow stage in the normal development of an erythrocyte, synonymous with polychromatophilic normoblast.


A young, immature normoblast.
Synonym(s): rubricyte.
[karyo- + G. kytos, cell]


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]


polychromatic normoblast.