Deterrent

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early 19th century: from Latin deterrent- ‘deterring’, from the verb deterrere (see deter).

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Latin deterrens, present participle of deterrere.

etymonline

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deterrent

1829, adjective ("having the power or tendency to deter") and noun ("that which deters or tends to deter"), in Bentham, from Latin deterrentem, present participle of deterrere "to frighten from, discourage from," from de "away" (see de-) + terrere "frighten, fill with fear" (see terrible). In reference to nuclear weapons, from 1954.