Usually means: Immune cells that destroy pathogens.
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We found 4 dictionaries that define the word natural killer:

General (2 matching dictionaries)
  1. natural killer: Wiktionary
  2. Natural killer: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. Natural killer: Encyclopedia

Medicine (1 matching dictionary)
  1. Natural killer: Medical dictionary

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Definitions from Wiktionary (natural killer)

▸ noun:  (immunology) A natural killer cell

Similar:
natural killer cell, killer T cell, lymphocyte, immunocyte, cytotoxic T cell, immunotoxicant, immunocytotoxicity, immunoeffector, immunotoxin, immunologic cytotoxicity, more...

Opposite:
unnatural, artificial, man-made, synthetic

Phrases:
natural killer cell, natural killer cells, natural killer (nk) cell, natural killer c's, nk c's, natural killer cs nk cs, more...

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Similar:
natural killer cell, killer T cell, lymphocyte, immunocyte, cytotoxic T cell, immunotoxicant, immunocytotoxicity, immunoeffector, immunotoxin, immunologic cytotoxicity, more...

Opposite:
unnatural, artificial, man-made, synthetic

Phrases:
natural killer cell, natural killer cells, natural killer (nk) cell, natural killer c's, nk c's, natural killer cs nk cs, natural killer lymphocyte, nk c's natural killer c's, more...



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