LATIN DICTIONARYLexicon Latīnum
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“emissary” in Latin

The English word emissary itself goes back to Latin ēmissārius.

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

emissary
Person sent on a mission, legatus: missus.
Spy, explorator: speculator: emissarius: excursor [SYN. in SPY]. (The words are found in this connection and order.) excursor et emissarius. An emissary of this man’s, istius excursoi et emissarius (Cic.).

Quick answer

What is the Latin word for emissary?
The usual Latin words for “emissary” are legō, mittō, explōrō; also speculātor, ēmissārius, excursor. 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.