书皮儿 Traditional form: 書皮兒 Pinyin (reading): shūpír Definitions: erhua variant of 書皮/书皮 (shūpí) Characters: 书 - book, letter, document; writing 皮 - skin, hide, fur, feathers 儿 - son, child Traditional characters: 書 - book, letter, document; writing 皮 - skin, hide, fur, feathers 兒 - son, child