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“traitor” in Latin

The English word traitor itself goes back to Latin dō, through trāditor.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

traitor
perduellis: perduellionis reus: majestatis reus (reus, as accused): civium or rei publicae paricida (Cic., Cat., 1, 12, 29; Sall., Cat., 51, 25. Vid: TREASON): proditor (that has an understanding with a foreign enemy, and acts in concert with him against his country; then, also, general term, one who injures the interests of his country). To be a traitor, paricidio patriae obstrictum esse.

Quick answer

What is the Latin word for traitor?
The usual Latin words for “traitor” are perduellis, cīvis, prōdō; also reus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.