Definition of "Marine" :

noun: a member of the United States Marine Corps

noun: a soldier who serves both on shipboard and on land

adjective: native to or inhabiting the sea

"Marine plants and animals such as seaweed and whales."

adjective: relating to or characteristic of or occurring on or in the sea

adjective: of or relating to the sea

"Marine explorations."

adjective: of or relating to military personnel who serve both on land and at sea (specifically the U.S. Marine Corps)

"Marine barracks."

adjective: relating to or involving ships or shipping or navigation or seamen

"Marine insurance."