counteract : Dictionary / Wörterbuch (BEOLINGUS, TU Chemnitz)

English Dictionary: counteract	by the DICT Development Group
2 results for counteract
From WordNet (r) 3.0 (2006) [wn]:
counteract v act in opposition to [syn: antagonize, antagonise, counteract] oppose or check by a counteraction Synonym(s): countercheck, counteract oppose and mitigate the effects of by contrary actions; "This will counteract the foolish actions of my colleagues" Synonym(s): counteract, countervail, neutralize, counterbalance destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war" Synonym(s): sabotage, undermine, countermine, counteract, subvert, weaken
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Counteract \Coun`teract"\ (koun`t?r-?kt"), v. t. [imp. & p. p. {Counteracted}; p. pr. & vb. n. {Counteracting}.] To act in opposition to; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract* the effect of medicines; to counteract good advice.