A person who has captured or imprisoned someone; someone who takes or holds another person against their will.
From Latin 'captor' (one who takes), from 'capere' (to take, seize). Same root gives us capture, captive, and caption.
The Latin root 'capere' (to take) branched into dozens of English words—capture, captive, caption, capital (as in the chief city), even captain! One root word built an empire of meaning.
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