acorn barnacle

English Thesaurus

1. barnacle that attaches to rocks especially in intertidal zones (noun.animal)

hypernym	:	barnacle, cirriped, cirripede,
definition	:	marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces (noun.animal)

member meronym	:	balanus, genus balanus,
definition	:	type genus of the family Balanidae (noun.animal)