marine
adjective
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native to or inhabiting the sea“marine plants and animals such as seaweed and whales”
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relating to or characteristic of or occurring on or in the sea
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of or relating to the sea“marine explorations”
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of or relating to military personnel who serve both on land and at sea (specifically the U.S. Marine Corps)“marine barracks”
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relating to or involving ships or shipping or navigation or seamennautical
noun
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a soldier who serves both on shipboard and on land