The Collaborative International Dictionary of English v.0.48:

Cashbook \Cash"book\ (k[a^]sh"b[oo^]k), n. (Bookkeeping)
   A book in which is kept a register of money received or paid
   out.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "cashbook":
   Domesday Book, account book, accounts payable ledger,
   accounts receivable ledger, address book, adversaria, album,
   annual, appointment calendar, appointment schedule, balance sheet,
   bank ledger, bankbook, blankbook, blotter, books, calendar,
   card ledger, catalog, classified catalog, commonplace book,
   cost card, cost ledger, cost sheet, court calendar, daybook,
   desk calendar, diary, diptych, docket, engagement book,
   factory ledger, inventory, journal, ledger, log, logbook,
   loose-leaf notebook, memo book, memorandum book, memory book,
   notebook, pad, passbook, petty cashbook, pocket notebook,
   pocketbook, police blotter, purchase ledger, record book, register,
   registry, sales journal, sales ledger, scrapbook, scratch pad,
   spiral notebook, stock ledger, stores ledger, suspense ledger,
   table, tablet, triptych, workbook, writing tablet, yearbook



Bouvier's Law Dictionary, Revised 6th Ed (1856):

CASH-BOOK, Commerce, accounts. One in which a merchant or trader enters an
account of all the money, or paper moneys he receives or pays. An entry of
the same thing ought to be made under the proper dates, in the journal. The
object of the cash-book is to afford a constant facility to ascertain the
true state of a man's cash. Pard. n. 87.