ヒザラガイ

Also written ひざらがい, じいがせ, 膝皿貝, 火皿貝, 石鼈, 爺が背

Meanings

1. Noun chiton (any marine mollusk of the class Polyplacophora); sea cradle
2. Japanese chiton (Acanthopleura japonica)

Jinuma: Japanese Dictionary · Word lists