Lewis & Short

nāvĭcŭlārĭus, a, um, adj. [navicula],

  1. I. of or belonging to a small ship, boat, or vessel (late Lat.): onus, Cod. Th. 13, 5, 12: PORTITOR, Inscr. Mur. 984, 1.
  2. II. Of or belonging to a ship-master: functio, Cod. Just. 11, 2, 3.
    Hence, subst.
    1. A. nāvĭcŭlārĭus, ii, m., a ship-owner who hires out vessels for money, a ship-master, Cic. Fam. 16, 9, 4; id. Att. 9, 3, 2: naviculariis nostris injuriosius tractatis, id. Imp. Pomp. 5, 11; cf.: mercatores, navicularii, id. Verr. 2, 2, 55, § 137; Tac. A. 12, 55.
    2. B. nāvĭcŭlārĭa, ae, f., the business of one who hired out small vessels for transporting passengers and goods, the shipping business: naviculariam facere, Cic. Verr. 2, 5, 18, § 46.