noun
thick book cover; book with thick binding
Refers to the physical cover of a book when it is thick, or to a book that has such a cover. Often used in contexts like bookbinding or describing a sturdy volume.
この辞書は厚表紙でできている。
This dictionary has a thick cover.
厚表紙の本は長持ちする。
Books with thick binding last a long time.
ハードカバー is a loanword for hardcover books, often implying a rigid cover, whereas 厚表紙 focuses on the thickness of the cover material.
Compound of 厚 (あつ, 'thick') and 表紙 (ひょうし, 'book cover'). The reading びょうし is a rendaku form of ひょうし.