Lewis & Short

pulmo, ōnis, m. [kindr. with πλεύμων, for πνεύμων].

  1. I. Lit., a lung; and in plur.: pulmones, the two lobes of the lungs, the lungs, Cic. N. D. 2, 55, 136; Cels. 4, 1; Plin. 11, 37, 72, § 188; Plaut. Curc. 2, 1, 21; Ov. M. 9, 201; id. P. 1, 3, 19; Pers. 3, 27.
    Very important in haruspicy, Cic. Div. 1, 39, 85; 2, 12, 29; Luc. 1, 622; Juv. 6, 548.
  2. II. Transf., a marine animal, a sea-lung, Plin. 9, 47, 71, § 154; 18, 35, 85, § 359; 32, 9, 32, § 102; hence, in allusion to its dulness: pulmon’es, qui perhibetur, Plaut. Ep. 5, 1, 21.