The Gutenberg Webster's Unabridged Dictionary: Section A and B

Book is used adjectively or as a part of many compounds; as, book buyer, bookrack, book club, book lore, book sale, book trade, memorandum book, cashbook.

Book account, an account or register of debt or credit in a book. -- Book debt, a debt for items charged to the debtor by the creditor in his book of accounts. -- Book learning, learning acquired from books, as distinguished from ...