A case or pair of boards covered with cloth or fancy paper, for binding a volume, or the periodical numbers or parts of a work; also a case for holding unbound serials, music, etc.
1885. C. Mackeson, Brit. Alm. Comp., 94. In some parts of the country identical titles are very differently applied. Among the double meanings [is] Book Case Maker for a Cabinet-maker or Bookbinder.