[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, hizaragai ( hiza sara kai ; hi sara kai ; ishi betsu ); jiigase ( ishi betsu ; jii ](n) (1) (uk) chiton (any marine mollusk of the class Polyplacophora); sea cradle; (2) Japanese chiton (Acanthopleura japonica)[Add to Longdo]