LATIN DICTIONARYLexicon Latīnum
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“assassin” in Latin

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

assassin
sicarius (one who makes murder a trade, of which the sica is his tool): percussor alicujus: auctor necis (one who actually struck the death-blow): interfector (general term occisor only in Plaut.; peremtor, interemtor, late). To hire an assassin, conducere aliquem ad caedem faciendam: to hire an assassin to kill anybody, percussorem emere in aliquem: percussorem alicui subrnare. Sometimes insidiator (one who kills by treacheury).

Quick answer

What is the Latin word for assassin?
The usual Latin words for “assassin” are sīcārius, interfector, īnsidior. 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.