Acorn-barnacle meaning

Any of various barnacles having a conical shell that is directly attached to rocks or other hard surfaces.
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Any of a genus (Balanus) of stalkless barnacles that resemble acorns.
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Origin of acorn-barnacle

  • From the resemblance of the barnacle in its shell to an acorn in its cupule

    From American Heritage Dictionary of the English Language, 5th Edition