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†, cotidal†. Adv. at sea, on sea; afloat.