One of the mysteries of the English language finally explained.
Originally: an account book belonging to a moneylender or money changer. Later: an account book or record showing the transactions of a bank; (now chiefly Law) such a book or record used as evidence in a court of law. Usually in plural Compare "bankbook".
Late 16th century; earliest use found in Samuel Daniel (?1563–1619), poet and historian. Partly from the genitive of banker + book.
bankers' book/ˈbaŋkəz ˌbʊk/
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