Source : WordNet®

clipboard
     n : a small writing board with a clip at the top for holding
         papers

Source : Free On-Line Dictionary of Computing

clipboard
     
         A temporary memory area, used to transfer
        information within a document being edited or between
        documents or between programs.  The fundamental operations are
        "cut" which moves data from a document to the clipboard,
        "copy" which copies it to the clipboard, and "paste" which
        inserts the clipboard contents into the current document in
        place of the current selection.
     
        Different {Graphical User Interfaces} vary in how they handle
        the different types of data which a user might want to
        transfer via the clipboard, some (e.g. the {X Window System})
        support only plain text, others (e.g. {NEXTSTEP}) support
        arbitrarily typed data.
     
        (1996-08-23)