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bar•na•cle(ˈbɑr nə kəl)
1. any marine crustacean of the subclass Cirripedia, having a shell made up of separate plates, being either stalked (goose barnacle) and attaching itself to ship bottoms and floating timber, or stalkless (rock barnacle).
2. one that clings tenaciously.
[1580–85; perhaps a conflation of barnacle barnacle goose with Cornish brennyk limpet (or Celtic cognates)]
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|Noun||1.||rock barnacle - barnacle that attaches to rocks especially in intertidal zones|
barnacle, cirriped, cirripede - marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces