noun

A barnacle is a type of marine crustacean that attaches itself to rocks, ships, or other objects in the water. They have a hard outer shell and long, feathery legs that they use to filter food from the water.

Example

1. The hull of the ship was covered in barnacles, slowing its speed through the water.
2. The rocks along the shore were teeming with barnacles, their long legs waving in the currents.
3. The scientist carefully removed a barnacle from its perch on a whale's skin to study its anatomy.