any of a class (Cirripedia) of saltwater crustaceans that are attached or parasitic as adults, including the barnacles and the rhizocephalans
See cirriped in American Heritage Dictionary 4
(sîrˈə-pĕdˌ) also cir·ri·pede(-pēdˌ)
noun
Any of various crustaceans of the subclass Cirripedia, which includes the barnacles and related organisms that attach themselves to objects or become parasitic in the adult stage.