Pronunciation: /ˈeɪˌkɔrn ˈbɑrnəkəl/
noun A type of barnacle that is commonly found on rocky shores and attaches itself to surfaces using a hard shell made of calcium carbonate.
A1 The acorn barnacle is a small marine crustacean that attaches itself to rocks.
A2 During low tide, you can see many acorn barnacles clinging to the rocks along the shore.
B1 Scientists study the feeding habits of acorn barnacles to understand their role in the ecosystem.
B2 The acorn barnacle's shell is made of calcium carbonate, providing protection from predators.
C1 Researchers are investigating the genetic diversity of acorn barnacles in different ocean habitats.
C2 The intricate mating behavior of acorn barnacles involves chemical signaling and competition for space.
formal The acorn barnacle is a type of marine crustacean that attaches itself to rocks along the shoreline.
informal I saw a bunch of those little acorn barnacles clinging to the dock at low tide.
slang Check out those tiny acorn barnacles stuck to the side of the boat!
figurative Like an acorn barnacle, she was firmly attached to her beliefs and wouldn't budge.
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