- noun an area of salt water between continents or islands which is large but not as large as an ocean
- (written as Sea)Archaic term sometimes used for the lunar Maria (Mare), which are in fact extremely dry plains of lava
- noun a mass of salt water, which covers most of the earth’s surface
Origin & History of “sea”
Sea is a widespread Germanic word, related to German see, Dutch zee, Swedish sjö, and Danish sø (the Scandinavian words are now more usually used for ‘lake’ than ‘sea’). these all point back to a prehistoric Germanic *saiwiz, but it is not known where that came from.