Lewis & Short

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pĕlăgĭum, ii, v. pelagius, II. B.

      1. 1. † pĕlăgĭus, a, um, adj., = πελάγιος, of or belonging to the sea, sea- (pure Lat. marinus): pelagii greges piscium, Varr. R. R. 3, 3, 10: pelagiae conchae, sea-mussels, Plin. 9, 29, 46, § 85: cursus, Phaedr. 4, 20, 7: matrona ornata phaleris pelagiis, i. e. with pearls and corals, P. Syrus ap. Petr. 55
  1. II. Subst.
    1. A. pĕlăgĭa, ae, f., a kind of pearl-mussel, Plin. 9, 37, 61, § 131.
    2. B. pĕ-lăgĭum, ii, n., purple color, Plin. 9, 38, 62, § 134; 9, 40, 64, § 138.

2. Pĕlăgĭus, ii, m., a famous heretic of the fifth century A. D., Aug. Ep. 175; id. Haeres. 88.
Hence, Pĕlăgĭānus, i, m., a follower of Pelagius, Isid. Orig. 8, 5, 63.

† pĕlăgus, i (Gr. plur. pelagē, Lucr. 5, 35; 6, 619), n., = πέλαγος,

  1. I. the sea (poet. and in post-Aug. prose for Lat. mare): fervit aestu pelagus, Pac. ap. Cic. de Or. 3, 39, 157: pelagus remis petere coeperunt, Auct. B. Hisp. 40: in pelago, Lucr. 4, 432: pelagus tenuere rates, the open sea, the main. Verg. A. 5, 8: pelago Danaūm insidias Praecipitare, id. ib. 2, 36: pelago dare vela patenti, id. G. 2, 41; 1, 142: qui fragilem truci Commisit pelago ratem, Hor. C. 1, 3, 11: pelago terrāque pericula passus, Ov. Tr. 3, 2, 7: lustrare pelagus, Val. Fl. 3, 608; Plin. 9, 10, 12, § 35; Juv. 1, 135; 12, 17: saeviente pelago, Tac. A. 15, 46: vortices pelagi, Just. 4, 1, 13: nantes lubrico pelagi, Val. Max. 3, 2, 10: pelagus Ciliciae, Vulg. Act. 27, 5.
    Poet., a mass of water, like the sea: pelago premit arva sonanti, Verg. A. 1, 246.
  2. II. Fig., for an immense mass or extent: quam pauca excepta verba ex pelago sermonis pulli minus trita afferant, the ocean of vulgar language, Varr. L. L. 9, 26, § 33: Herodiani scriptorum pelagus, Prisc. Ep. ad Jul. 4; cf. “a sea of troubles,” Shaksp.