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natural childbirth
natural death
natural disaster
natural fiber
natural food
natural frequency
natural gas
natural history
natural killer cell
natural language
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natural law
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natural logarithm
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natural killer cell
nat·u·ral kill·er cell (plural nat·u·ral kill·er cells)


noun 
Definition:
 
cell that fights infection: a white blood cell lymphocyte that can recognize microbes and tumor cells as "foreign," without requiring prior exposure to them, and destroy them
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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