Definition of white blood cell noun from the Oxford Advanced Learner's Dictionary

 

white blood cell

 noun
noun
BrE BrE//ˌwaɪt ˈblʌd sel//
 
; NAmE NAmE//ˌwaɪt ˈblʌd sel//
 
(also white cell)(specialist leucocyte)(biology)
 
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any of the clear cells in the blood that help to fight disease
See the Oxford Advanced American Dictionary entry: white blood cell