ma·rine 
(mə-rēn)
(mə-rēn)adj.
1.
a. Of or relating to the sea: marine exploration.
b. Native to, inhabiting, or formed by the sea: marine animals.
c. Relating to a system of oceanic habitats coextensive with the continental shelf, ranging from deep water to unprotected coastlines and characterized along its landward edge by exposure to wave action and tidal currents and by the absence of trees, shrubs, or emergent vegetation.
2. Of or relating to shipping or maritime affairs.
3. Of or relating to sea navigation; nautical: a marine chart. See Synonyms at nautical.
4. Of or relating to troops that serve at sea as well as on land, specifically the US Marine Corps.
n.
1.
a. A soldier serving on a ship or at a naval installation.
b. often Marine A member of the US Marine Corps.
2. The mercantile or naval ships or shipping fleet of a country.
3. The governmental department in charge of naval affairs in some nations.
4. A painting or photograph of the sea.
[Middle English marin, marine, from Old French, from Latin marīnus, from mare, sea; see mori- in the Appendix of Indo-European roots.]