acorn shell

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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