There is a QStarDict in Extras-testing ( http://talk.maemo.org/showthread.php?t=38984 ). It's an offline dictionary. But you have to download dictionary databases first to use it. It also has a web based dictionary plugin but it is not very useful.
You can find dictionaries for it at http://xdxf.revdanica.com/down2/inde...ormat=StarDict or at http://stardict.sourceforge.net/Dictionaries.php