The Collaborative International Dictionary of English v.0.48:

Roxburgh \Rox"burgh\ (?; Scot. ?), n. [From the third duke of
   Roxburgh (Scotland), a noted book collector who had his books
   so bound.]
   A style of bookbinding in which the back is plain leather,
   the sides paper or cloth, the top gilt-edged, but the front
   and bottom left uncut.
   [1913 Webster]