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 practical knowledge. Neither does it so much require book learning and scholarship, as good natural sense, to distinguish true and false. . Book louse, to lay bets (recorded in a pocket book) against the success of every horse, so that the bookmaker wins on all the unsuccessful horses and loses only on the winning horse or horses. To speak by the book, to speak with minute exactness. Without book. By memory. Without authority.
Origin: oe. Book, bok, as. Bc; akin to goth. Bka a letter, in pl. Book, writing, Icel. Bk, Sw. Bok, dan. Bog, os. Bk, D. Boek, OHG. Puoh, g. Buch; and fr. As. Bc, bce, beech; because the ancient saxons and germans in general wrote runes on pieces of beechen board. Cf. Beech.