<p><strong>Noun</strong></p><ul><li>the salt waters that cover the greater part of the earth's surface.</li><li>a division of these waters, of considerable extent, more or less definitely marked off by land boundaries: the North Sea.</li><li>one of the seven seas; ocean.</li><li>a large lake or landlocked body of water.</li><li>the degree or amount of turbulence of the ocean or other body of water, as caused by the wind.</li><li>the waves.</li><li>a large wave: The heavy seas almost drowned us.</li><li>a widely extended, copious, or overwhelming quantity: a sea of faces; a sea of troubles.</li><li>the work, travel, and shipboard life of a sailor: The sea is a hard life but a rewarding one.</li><li>Astronomy: mare.</li></ul><p><strong>Adjective</strong></p><ul><li>of, relating to, or adapted for use at sea.</li></ul>