acorn barnacle(redirected from acorn barnacles)
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Any of various barnacles having a conical shell that is directly attached to rocks or other hard surfaces.
[From the resemblance of the barnacle in its shell to an acorn in its cupule .]
(Animals) any of various barnacles, such as Balanus balanoides, that live attached to rocks and have a volcano-shaped shell from the top of which protrude feathery food-catching appendages (cirri)
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|Noun||1.||acorn barnacle - barnacle that attaches to rocks especially in intertidal zones|
barnacle, cirriped, cirripede - marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces