Just one thing, the dictionary has to be in a format that the Cybook can read! If you have the Cybook firmware for mobipocket, the dictionary must be in mobi format, and you will be able to use it to look up a word directly from a book you are reading. Unfortunately that is the only practical way to use a dictionary on a gen3, since there is no search or lookup function within the dictionary itself.
If you have the ePub firmware, I don't think you can really use a dictionary. The ePub format doesn't include a dictionary definition at the moment. You could convert a dictionary to ePub format, but again it's not of much practical use since you will be unable to search for a word, and the look-up functionality is not supported by the ePub firmware.
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