Lewis & Short

Tēthys, yos, f., = Τηθύς,

  1. I. a sea-goddess, wife of Oceanus, and mother of the seanymphs and river-gods; acc. Tethyn, Ov. F. 5, 81: Tethyos neptes, id. ib. 5, 168; Verg. G. 1, 31; Cat. 64, 29; 66, 70.
  2. II. Transf., the sea, Ov. M. 2, 69; 2, 509; Luc. 1, 413; Sil. 3, 60; Mart. Spect. 3, 6; Sen. Herc. Fur. 886.