pocketbook (n.)youdaoicibaDictYouDict[pocketbook 词源字典]
also pocket-book, 1610s, originally a small book meant to be carried in one's pocket, from pocket (n.) + book (n.). Meaning "a booklike leather folder for papers, bills, etc." is from 1722. Meaning "a woman's purse" is from 1816.[pocketbook etymology, pocketbook origin, 英语词源]