Poikilocytosis Sickled Erythrocyte SCDO:1000246 Sickled Erythrocyte An irreversible distortion of the morphology of an erythrocyte such that the cells are elongated and curved, resembling the blade of a sickle (the hand-held agricultural tool traditionally used to harvest grains). Sickled Red Blood Cell HP:0030058 Sickle Cell Drepanocyte Sufficient Banana Cell