Lewis & Short

Appĭus, ii, m., and Appĭa, ae, f. (abbrev. App.).

  1. I. A Roman prœnomen, esp. of persons of the gens Claudia; hence,
  2. II. Appĭus, a, um, adj., Appian.
    1. A. Appia via, the Appian Way, a well-known high-road, begun by the censor Appius Claudius Cœcus (about 442 A. U. C.), which began in Rome at the Porta Capena, and passed in a direct line to the Albanian Mountains, and thence through the Pontine Marshes to Capua; later it was continued to Brundisium, perh. by Trajan (the stones were large polygons of basaltic lava; parts here and there are yet in existence), Cic. Imp. Pomp. 18, 55; id. Mil. 6, 15; id. ad Q. Fr. 1, 1, 6; id. Phil. 7, 1, 1; Liv. 9, 29, 6; Front. Aquaed. 5; Inscr. Orell. 131; cf. Müll. Roms Camp. 2, 230.
      Called also Appī via, Hor. Ep. 1, 6, 26; and simply Appia, id. Epod. 4, 14, al.; Cic. Att. 2, 12.
    2. B. Appia aqua, the aqueduct which this same Appius constructed; Front. Aquaed. 5; cf. Liv. 9, 29.
    3. C. Appii Forum, a small market-town in Latium, founded by the same Appius, on the left side of the Via Appia, in the midst of the Pontine Marshes, now Foro Appio, Hor. S. 1, 5, 3; Vulg. Act. 28, 15; cf. Mann. Ital. I. 637 and 638.