LATIN DICTIONARYLexicon Latīnum
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“horizon” in Latin

The English word horizon itself goes back to Latin horizōn.

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

horizon
orbis finiens (Cic.): orbis, qui adspectum nostrum definit (Cic.): circulus finiens: finitor or finiens; or linea, quae inter aperta et occulta est, or horizon (Sen.; all N. Quaest., 5, 17): linea, quae dicitur horizon (Vitr.). To cut the horizon at right angles, horizonta rectis angulis secare (Sen., N. Quaest., 5, 17). The sun rises above the horizon, sol emergit de subterranea parte or supra terram: anything bounds our horizon, aliquid aspectum nostrum definit.

Quick answer

What is the Latin word for horizon?
The usual Latin words for “horizon” are orbis, fīniō, līnea; also horizōn. 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.