Dictionary.net

• 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.

2010 - New Age Dictionary Database
By Oddity Software

• 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's Revised Unabridged Dictionary
By Noah Webster.