/ məˈriːn; NAmE / adjective , noun
■ adjective [ only before noun ]
1.
connected with the sea and the creatures and plants that live there :
marine life
a marine biologist (= a scientist who studies life in the sea)
2.
connected with ships or trade at sea
■ noun
a soldier who is trained to serve on land or at sea, especially one in the US Marine Corps or the British Royal Marines
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WORD ORIGIN
Middle English (as a noun in the sense seashore ): from Old French marin , marine , from Latin marinus , from mare sea.