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killer cell

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noun Immunology.
  1. any of several types of lymphocyte or leukocyte capable of destroying cells that have acquired foreign characteristics, as a tumor cell or virus-infected cell.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for killer cell

killer cell

noun
  1. a type of white blood cell that is able to kill cells, such as cancer cells and cells infected with viruses
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

killer cell in Medicine

killer cell

(kĭlər)
n.
  1. A large differentiated T cell that attacks and lyses target cells bearing specific antigens.cytotoxic T cell killer T cell null cell
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.