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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American Heritage
Cultural Dictionary

white blood cells definition


Colorless cells in the blood that help combat infection. Some white blood cells act as scavengers by engulfing foreign particles (such as bacteria) and destroying them. Others produce antibodies or destroy dead cells. (See AIDS.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Kicking them out if no more feasible nor desirable than purging your body of
  white blood cells.
Somewhere on that segment, he reasoned, was a gene crucial to preventing white
  blood cells from becoming cancerous.
And the immune system can constantly regenerate and circulate new white blood
  cells to broaden its diversity still further.
But the researchers found that white blood cells produced in response to the
  vaccine were defective.
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