Definition The white blood cell or leukocyte is an immune cell that protects the body from endotoxins, invading pollutants, bacteria, and viruses; this broad group of cells also removes dead or damaged cells. White blood cells are split into two main groups – granular and non-granular. Granular white blood cells are basophils, eosinophils, and neutrophils. […] The post White Blood Cell appeared first on Biology Dictionary.