One who contradicts; a person or thing that opposes, denies, or contradicts another.
From Latin 'contradictor' (one who speaks against), from 'contradicere' (contra- opposite + dicere to speak). Similar to 'contradicter' but with Latin form.
Medieval scholars called someone a 'contradictor' if they formally challenged a doctoral candidate's thesis—it was an official role in academic debate, and being a good contradictor was a mark of intellectual prowess.
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