What is the definition of Marine Ivy?

Marine ivy? Now that's a plant name that's as weird as a ghost ship on a tropical vacation. Imagine it's a vine with the ability to latch onto anything underwater, from ships to seagulls to even the hull of a submarine. It's like nature's version of a super-sticky, oceanic version of Velcro. But don't worry, it's not the kind of ivy that wants to climb into your dreams and start floating around.

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Here's an unsettling example sentence: "The marine ivy decided to take a liking for my old laptop, convinced it was the perfect host for its underwater empire."