Jisho

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Noun
1. grandfather (may be used after name as honorific)Familiar language, Usually written using kana alone, See also 祖父さん, usu. 祖父ちゃん
2. male senior-citizen (may be used after name as honorific)Usually written using kana alone, See also 爺さん, usu. 爺ちゃん
Other forms
祖父ちゃん 【じいちゃん】

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