noun
a small marine crustacean with a shell that attaches itself to rocks, ship bottoms, and other objects
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Barnacles are small marine crustaceans that attach themselves to hard surfaces such as rocks or the hulls of ships.
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I found a bunch of barnacles stuck to the bottom of the boat.
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That old car is covered in barnacles, it's definitely seen better days.
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The barnacles of bureaucracy were slowing down the progress of the project.