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  1. thumb index

    • IPA[ˈTHəm ˌindeks]

    美式

    • n.
      a set of lettered or marked grooves cut down the side of a book, especially a diary or dictionary, for easy reference.
    • noun: thumb index, plural noun: thumb indexes

    • 更多解釋
    • IPA[ˈθʌm ˌɪndɛks]

    英式

    • n.
      a set of lettered grooves cut down the side of a book, especially a diary, address book, or ...

    Oxford Dictionary