Lewis & Short

occĭdŭus, a, um, adj. [2. occĭdo, I.].

  1. I. Lit.
    1. A. Going down, setting (poet. and in post-class. prose): sole jam fere occiduo, Gell. 19, 7, 2: occiduo sole, Ov. M. 1, 63: oriens occiduusque dies, id. F. 4, 832: nox, Calp. Ecl. 3, 82; Stat. Th. 3, 33: Phoebus, Ov. M. 14, 416.
    2. B. Transf., western: ab occiduo sole, Ov. F. 5, 558: occiduae aquae, id. ib. 1, 314: occiduae primaeque domus, in the west and in the east, Stat. S. 1, 4, 73; id. Th. 1, 200: Mauri, Luc. 3, 294: montes, Val. Fl. 2, 621: hora, the evening hour, hour of sunset, Calp. Ecl. 5, 34.
      As subst.: occiduus (sc. sol), the west, Isid. 5, 35, 8.
  2. II. Trop.
    1. A. Sinking, failing: labitur occiduae per iter declive senectae, Ov. M. 15, 227.
    2. B. Frail, perishable: exsortes animae carnis ab occiduo, Paul. Nol. Carm. 34, 306.