Terminator

wiktionary

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terminator (plural terminators)

etymonline

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terminator (n.)

1770, "line of separation between the bright and dark parts of a moon or planet," from Late Latin terminator "he who sets bounds," agent noun from terminare "to mark the end or boundary," from terminus "end, limit" (see terminus). Meaning "one who terminates" (something) is attested from 1846.