Definitions for "White blood cells"
A group of cells that are involved in protecting the body from infection and invasive foreign materials.
Any of the blood cells that are colorless, lack hemoglobin, contain a nucleus, and include the lymphocytes, monocytes, neutrophils, eosinophils, and basophils -- called also leukocyte, white blood corpuscle, white cell, white corpuscle.
Infection-fighting cells carried in the blood to areas of infection and inflammation.