1.the sea, Hom., etc.; when he uses it of a particular sea, he means the Mediterranean, opp. to Ὠκεανός; — Hdt. calls the Mediterranean ἥδε ἡ θάλασσα; so, ἡ παρ᾽ ἡμῖν θάλ. Plat.; κατὰ θάλασσαν by sea, opp. to πεζῇ by land, Hdt.; to κατὰ γῆς, Thuc.:—metaph., κακῶν θ. a sea of troubles, Aesch.
2.a well of salt water, said to be produced by a stroke of Poseidon's trident, in the Acropolis at Athens, Hdt.
