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“interpreter” in Latin

The English word interpreter itself goes back to Latin interpres, through interpretātōr.

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

interpreter
interpres (the proper word): explanator (one who explains another’s meaning; also, dreams, oracles, etc.): enarrator (who explains hermeneutically): explicator (PROP., one who unfolds, and so explains what was involved). The interpreters or expounders of the will of God, scriptores, qui sunt Dei quasi interpretes internunciique (after Cic., Phil., 13, 5, 12). To speak with anybody though an interpretor, per interpretem cum aliquo colloqui (Gell.; ☞ Caes., B.G., 1, 19).

Quick answer

What is the Latin word for interpreter?
The usual Latin words for “interpreter” are interpres, explānō, ēnārrō; also explicō, scrīptor. 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.