white blood cell
US /ˌwaɪt ˈblʌd sel/
UK /ˌwaɪt ˈblʌd sel/
1.
a colorless cell that circulates in the blood and body fluids and is involved in counteracting foreign substances and disease; a leukocyte.
:
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A high count of white blood cells can indicate an infection.
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White blood cells are crucial for the body's immune response.