Word日に本ほんnihonMeaningJapanPart of speechnounPronunciationCourseJapaneseLessonい-adjectives and な-adjectivesBreakdown of nihonbook; origin本To make a book, you need approximately one tree.sun; day日Usages of nihon日に本ほん は きれいな 国くに です。nihon ha kireina kuni desu.Japan is a beautiful country.