1) Erythrocyte 2) Red blood cell 
An erythrocyte containing granules of free iron, as detected by the Prussian blue reaction, in the blood of normal foetuses, where they constitute from 0.10 to 4.5% of the erythrocytes. ... Origin: sidero-+ G. Kytos, cell ... (05 Mar 2000) ... 
(sid´әr-o-sīt″) a red blood cell containing nonhemoglobin iron.
Type: Term Pronunciation: sid′ĕr-ō-sīt′ Definitions: 1. An erythrocyte containing granules of free iron, as detected by the Prussian blue reaction, in the blood of normal fetuses, where they constitute from 0.10-4.5% of the erythrocytes.
[n] - an abnormal red blood cell containing granules of iron not bound in hemoglobin
noun an abnormal red blood cell containing granules of iron not bound in hemoglobin