LATIN DICTIONARYLexicon Latīnum
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“beacon” in Latin

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

beacon
specula (watch-tower): ignium significatio (a beacon as lighted to convey intelligence): pharus (φἁρος, light-house, Suet., Calig., 46: turris. ex qua ut ex Pharo, noctibus ad regendos navium cursus ignes emicarent).”To light a beacon, ignibus facere significationem (to light signal-fires). Beacon-lights, ignis e specula sublatus, Cic.: praenunciativi ignes (Plin.).

Quick answer

What is the Latin word for beacon?
The usual Latin words for “beacon” are speculum, pharus, turris. 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.