acorn barnacle


Also found in: Dictionary, Thesaurus, Wikipedia.
Related to acorn barnacle: Balanus balanoides

acorn barnacle

[′ā‚kȯrn ‚bär·nə·kəl]
(invertebrate zoology)
Any of the sessile barnacles that are enclosed in conical, flat-bottomed shells and attach to ships and near-shore rocks and piles.