sometimes i needed for a desktop dictionary on ubuntu linux, now i found how to setup the arabic dictionary in the linux Dictionary:

for gnome :

– open Applications Menu -> Accessories -> Dictionary.

– the Dictionary application is opened. now click edit menu and select Preferences.

– in the source tab click Add button.

– A new window opened, in the Description field write: Arabic Dictionary. or whatever you want to name it.

– let Transport select box as Transport.

– Hostname :

– Port: 2628

now enjoy using the desktop dictionary.