Lewis & Short

† hŏrīzon, ontis, m., = ὁρίζων (sc. κύκλος or ἀήρ).

  1. I. The horizon (pure Lat. finiens and finitor), Macr. Somn. Scip. 1, 15 fin.; id. S. 7, 14 fin.; Hyg. Astr. 1, 4.
  2. II. A line drawn through the centre of a sundial, Vitr. 9, 8.