[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)
[じいさん, jiisan] (n) (1) (usu. 祖父さん) (See お祖父さん) grandfather (may be used after name as honorific); (2) (usu. 爺さん) male senior-citizen (may be used after name as honorific); (P)
[じいちゃん, jiichan] (n) (1) (fam) (usu. 祖父ちゃん) (See 祖父さん) grandfather (may be used after name as honorific); (2) (usu. 爺ちゃん) male senior-citizen (may be used after name as honorific)