erythrocyte size trait Any measurable or observable characteristic related to the physical magnitude of the cells in the blood that carry oxygen, red blood cells EFO:0004526 CMO:0002538 CMO:0000038 CMO:0000037 VT:0000248 EFO:0009188 CMO:0000041 red blood cell size trait CMO:0003232 Trait.ontology erythrocyte morphology trait