In Medicine and Hematology, it is an immature blood cell form that gives rise to an erythrocyte. Erythroblast. It means it originates the blood, which gives rise to the blood.
It's a way of calling hemogonia. From Greek 945; 953; 956; 945; ( aima "blood" ) 946; 955; 945; 963; 964; 959; 962; ( blastós "germ, origin" ).