noun
back cover
Refers specifically to the outer back cover of a book, magazine, or similar bound publication.
この本の裏表紙には著者の写真が載っている。
The author's photo is on the back cover of this book.
背表紙 is the spine of a book, distinct from the back cover.
Compound of 裏 (ura, 'back') and 表紙 (hyōshi, 'cover'). The reading びょうし is a rendaku form of ひょうし.