A person who makes thorough or harsh inquiries and investigations, or historically, an official of the Spanish Inquisition.
From Latin 'inquisitor,' derived from 'inquirere' meaning 'to search for or investigate.' The prefix 'in-' means 'into' and 'quaerere' means 'to seek,' so literally 'one who seeks into things.'
The Spanish Inquisition used the term to describe officials who investigated religious heresy—it's one of history's most feared institutions, which is why calling someone an 'inquisitor' now suggests aggressive questioning.
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