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counteract

coun·ter·act

counteract

 
pronunciation:
kaUn tr aekt
features:
Word Parts
part of speech: transitive verb
inflections: counteracted, counteracting, counteracts
definition: to overcome or lessen the effect of through opposition or opposite action.
The antidote counteracted the poison.
 
synonyms:
countervail, neutralize
antonyms:
encourage, enhance, exacerbate
similar words:
annul, cancel, counterbalance, destroy, invalidate, negative, nullify, offset, oppose, overcome, rescind, reverse, undo
derivations: counteractive (adj.), counteraction (n.)
Word Parts
The word counteract contains the following part:
counter-, contra- Latin prefix that means against, in the opposite direction