white blood cell

noun
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.
Also called leukocyte, white blood corpuscle, white corpuscle, white cell.


Origin:
1885–90

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Collins
World English Dictionary
white blood cell
 
n
a nontechnical name for leucocyte

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

white blood cell n.
Abbr. WBC
Any of the colorless or white cells in the blood that have a nucleus and cytoplasm and help protect the body from infection and disease through specialized neutrophils, lymphocytes, and monocytes. Also called leukocyte, white corpuscle.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
white blood cell   (wīt)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
T cells are a type of white blood cell that mediate the immune system's
  response to viral invaders.
T lymphocytes, a type of white blood cell, serve as a frontline defense against
  invading bacteria and viruses.
Myeloma is a cancer that starts in plasma cells, a type of white blood cell.
In those early days doctors monitoring the liquidators watched white blood cell
  counts drop and feared for their health.
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