介かい殻かくMeanings1nounsea shellGeneral term for a shell from the sea; can refer to the shell itself or as a material.海かい岸がんで美うつくしい介かい殻かくを拾ひろった。I picked up a beautiful sea shell on the beach.この飾かざりは介かい殻かくでできている。This decoration is made of sea shells.