膝皿貝
  火皿貝
  石鼈
  爺が背
  ひざらがい
  膝皿貝
  火皿貝
  石鼈
  じいがせ
  石鼈
  爺が背
  ヒザラガイ
  noun (common) (futsuumeishi)
  word usually written using kana alone
  chiton (any marine mollusk of the class Polyplacophora)
  sea cradle
  Japanese chiton (Acanthopleura japonica)
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