WHITE BLOOD CELL Definition & Meaning

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white blood cell

any of various nearly colorless cells of the immune system that circulate mainly in the blood and lymph and participate in reactions to invading microorganisms or foreign particles, comprising the B cells, T cells, macrophages, monocytes, and granulocytes.

white blood cell

white blood cell

Any of various white or colorless cells in the blood of vertebrate animals, many of which participate in the inflammatory and immune responses to protect the body against infection and to repair injuries to tissues. White blood cells are formed mainly in the bone marrow, and unlike red blood cells, have a cell nucleus. The major types of white blood cells are granulocytes, lymphocytes, and monocytes. White blood cells are far less numerous in the blood than red blood cells, but their amount usually increases in response to infection and can be monitored as part of a clinical assessment.
Also called leukocyte

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First recorded in 1885–90

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My white blood cell count was low too, which can also be a sign of cancer.

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These are tiny cyborgs, though even tinier ones exist, involving microbes like bacteria or even a type of white blood cell.

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He’s undergoing a second round of chemotherapy and receiving white blood cell injections to aid his immune system.

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Long-term use can also cause a deficiency of vitamin B-12, which leads to reduced white blood cell count and anemia.

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These take instructions from the white blood cells known as dendritic cells, which he refers to as the "generals" of the immune system.

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