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Related to acorn barnacle: Balanus balanoides
acorn barnacle[′ā‚kȯrn ‚bär·nə·kəl]
Any of the sessile barnacles that are enclosed in conical, flat-bottomed shells and attach to ships and near-shore rocks and piles.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.