a.
n. A support placed at the end of a row of books to keep them upright (on a shelf or table). [ WordNet 1.5 ]
n. One who enters accounts or names, etc., in a book; a bookkeeper. [ 1913 Webster ]
a. Not written in a book; unrecorded. “UnbookedEnglish life.” Masson. [ 1913 Webster ]