Roget's Thesaurus: Entry 341 (Ocean -- N)

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#341. Ocean -- N. sea, ocean, main, deep, brine, salt water, waves, billows, high seas, offing, great waters, watery waste, "vasty deep"; wave, tide, &c. (water in motion) 348.

hydrography, hydrographer; Neptune, Poseidon, Thetis, Triton, Naiad, Nereid; sea nymph, Siren; trident, dolphin.

Adj. oceanic; marine, maritime; pelagic, pelagian; seagoing; hydrographic; bathybic[obs], cotidal[obs].

Adv. at sea, on sea; afloat.