from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of various barnacles having a conical shell that is directly attached to rocks or other hard surfaces.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun barnacle that attaches to rocks especially in intertidal zones
from The American Heritage® Dictionary of the English Language, 4th Edition
[From the resemblance of the barnacle in its shell to an acorn in its cupule .]
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