1. relating to the sea or ocean
2. living in or found in the sea

1. a member of the U.S. Marine Corps or similar military force
2. a soldier trained to serve on ships or in naval operations

Examples

• Marine biologists study ocean life.
• The coral reef supports diverse marine ecosystems.
• Whales and dolphins are marine mammals.
• The marine served three tours overseas.
• Marine forces landed on the beach at dawn.
• She studies marine science at the university.
• The marine environment is threatened by pollution.