acorn-barnacle

acorn barnacle

noun
See under barnacle1 ( def 1 ).
Dictionary.com Unabridged

barnacle

1 [bahr-nuh-kuhl]
noun
1.
any marine crustacean of the subclass Cirripedia, usually having a calcareous shell, being either stalked (goose barnacle) and attaching itself to ship bottoms and floating timber, or stalkless (rock barnacle or acorn barnacle) and attaching itself to rocks, especially in the intertidal zone.
2.
a person or thing that clings tenaciously.

Origin:
1580–85; perhaps a conflation of barnacle barnacle goose with Cornish brennyk, Irish báirneach limpet, Welsh brenig limpets, reflecting the folk belief that such geese, whose breeding grounds were unknown, were engendered from rotten ships' planking

barnacled, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
acorn barnacle or acorn shell
 
n
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)
 
acorn shell or acorn shell
 
n

barnacle (ˈbɑːnəkəl)
 
n
1.  acorn barnacle See goose barnacle any of various marine crustaceans of the subclass Cirripedia that, as adults, live attached to rocks, ship bottoms, etc. They have feathery food-catching cirri protruding from a hard shell
2.  a person or thing that is difficult to get rid of
 
[C16: related to Late Latin bernicla, of obscure origin]
 
'barnacled
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

barnacle
early 13c., "species of wild goose;" as a type of "shellfish," first recorded 1580s. Often derived from a Celtic source (cf. Bret. bernik, a kind of shellfish), but the application to the goose predates that of the shellfish in Eng. The goose nests in the Arctic in summer and returns to Europe in the
winter, hence the mystery surrounding its reproduction. It was believed in ancient superstition to hatch from barnacle's shell, possibly because the crustacean's feathery stalks resemble goose down. The scientific name of the crustacean, Cirripedes, is from Gk. cirri "curls of hair" + pedes "feet."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
barnacle   (bär'nə-kəl)  Pronunciation Key 
Any of various small marine crustaceans of the subclass Cirripedia that form a hard shell in the adult stage and attach themselves to underwater surfaces, such as rocks, the bottoms of ships, and the skin of whales.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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