Dictionary

counteract

verb coun·ter·act \ˌkan-tər-ˈakt\

: act against (something) : to cause (something) to have less of an effect or to have no effect at all

Full Definition of COUNTERACT

transitive verb
:  to make ineffective or restrain or neutralize the usually ill effects of by means of an opposite force, action, or influence <a drug used to counteract fatigue>
coun·ter·ac·tion \-ˈak-shən\ noun
coun·ter·ac·tive \-ˈak-tiv\ adjective
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Examples of COUNTERACT

  1. The drug will counteract the poison.
  2. <this medication will counteract the symptoms but it won't kill the infection>

First Known Use of COUNTERACT

1655
COUNTERACTING Defined for Kids

counteract

verb coun·ter·act \ˌkan-tər-ˈakt\
coun·ter·act·edcoun·ter·act·ing

Definition of COUNTERACT for Kids

:  to make (something) have less of an effect or no effect at all <The antidote counteracts the poison.>
Medical Dictionary

counteract

transitive verb coun·ter·act \ˌkant-ə-ˈrakt\

Medical Definition of COUNTERACT

:  to make ineffective or restrain or neutralize the usually ill effects of by an opposite force <vitamin K counteracts the effects of warfarin>
coun·ter·ac·tion \-ˈrak-shən\ noun

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