ハードカバー

noun, noun which may take the genitive case particle 'no'

hardcover; hardback

Refers to a book with a rigid, durable cover, as opposed to a paperback. Used both as a noun and as a no-adjective to describe a book's binding.

• この小しょう説せつはハードカバーで買かった。

  I bought this novel in hardcover.

• ハードカバーの本ほんは丈じょう夫ぶで長なが持もちする。

  Hardcover books are sturdy and last a long time.