From Longman Dictionary of Contemporary Englishred blood cellˌred ˈblood cell (also red corpuscle) noun [countable] HBone of the cells in your blood that carry oxygen to every part of your body → white blood cell
Examples from the Corpus
red blood cell• Urine analysis, a red blood cell count, and blood pressure were also routinely recorded.• The question is what will happen to the red blood cell nucleus if it is placed in cancer cell cytoplasm?• The red blood cell is finally a small bag containing haemoglobin molecules for transporting oxygen. 