Lewis & Short

costa, ae, f.,

  1. I. a rib, Cels. 8, 1; Plin. 11, 37, 82, § 207; Plaut. Ps. 1, 2, 4; Lucr. 5, 1297; Verg. G. 1, 273; id. A. 1, 211; Ov. H. 9, 111; Stat. Th. 2, 9; Mart. 9, 48, 10.
  2. II. Transf., a side, a wall: aheni, Verg. A. 7, 463: ratis, Pers. 6, 31; cf. navium, Plin. 13, 9, 19, § 63: corbium, id. 16, 18, 30, § 75.
    Absol., Verg. A. 2, 16 al.