dict-notify
dict-notify is a small tool for automatically looking up selected words with the dictd daemon and dispaying the results over the notification-system.
The developement is not yet complete, therefore one must compile the code on its own. (one execption is the aur buildscript dict-notify-git for archlinux users) further must the dictd be started before dict-notify or it may crash.
More on the Github project page (in English)
Or directly download the code with git:
git clone git://github.com/boscowitch/dict-notify.git