LATIN DICTIONARYLexicon Latīnum
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“sentinel” in Latin

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

sentinel
excubitor (Caes.): miles stationarius (Ulp.): statio (Caes., sentinels placed at the gates as outposts): excubiae (Tac., especially before a palace, as guards of honor, etc.): vigil (by night, Liv.; collectively vigiliae). To place sentinels, disponere excubias (Tac.), stationes (Caes.). Also, in a wider sense, custos: speculator

Quick answer

What is the Latin word for sentinel?
The usual Latin words for “sentinel” are excubitor, statiō, excubiae; also vigil, custōs, speculātor. 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.