verb (used with object), inactivated, inactivating.
to make inactive: The bomb was inactivated.
Immunology. to stop the activity of (certain biological substances).

1905–10; inactive + -ate1

inactivation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
inactivate (ɪnˈæktɪˌveɪt)
(tr) to render inactive

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

inactivate in·ac·ti·vate (ĭn-āk'tə-vāt')
v. in·ac·ti·vat·ed, in·ac·ti·vat·ing, in·ac·ti·vates

  1. To render nonfunctional.

  2. To make quiescent.

in·ac'ti·va'tion n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Ultraviolet radiation from the sun and a temperature increase inside the
  bottles inactivate pathogens, making it safe to drink.
The researchers tried again, but used a short-lived protein switch to
  inactivate the genes.
The consequence is to inactivate the gene being methylated.
Others generate powerful enzymes that inactivate the drugs.
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