拇指甲 Traditional form: 拇指甲 Pinyin (reading): mǔzhǐjia Definitions: thumbnail Characters: 拇 - thumb; big toe 指 - finger, toe; to point, to indicate 甲 - armor, shell; fingernails; 1st heavenly stem Traditional characters: 拇 - thumb; big toe 指 - finger, toe; to point, to indicate 甲 - armor, shell; fingernails; 1st heavenly stem