LATIN DICTIONARYLexicon Latīnum
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“counteract” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

counteract
obviam ire alicui rei; occurrere alicui rei (to take preventive measures). (The words are found in this connection and order), occurrere atque obsistere (Cic.): comprimere: reprimere: supprimere (to check it, keep it under): to counteract anybody’s designs, alicujus consiliis occurrere atque obsistere (Cic.): the factious proceedings of our enemies, factioni inimicorum resistere (Cic.): obniti: obluctari (struggle against). To counteract the symptoms of a disease, morbo opponere medicinam: Vid. RESIST, OPPOSE.

Quick answer

What is the Latin word for counteract?
The usual Latin words for “counteract” are comprimō, reprimō, supprimō; also obnītor, oblū̆ctor. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.