Artha is good offline thesaurus/dictionary tool .It is easy to use and also has great features.It can give you not only definitions of words,but also its antonyms,synonyms,derivatives of the word.It has a toggle button which can be used to switch between simple and advanced mode.The later option is cool to use to learn more about the word you are searching for.Also if you click on any word on the tool,the tool "looks-up" those words too.
How To get it:-
==>Use the search tool @ www.software.opensuse.org and search for "artha".You can search for tool for older versions of openSUSE like 11.3
==>It would be available in "Education" repository
==>Click on "1-Click Install"and the YaST tool will ask for admin password.
You need not worry about your underlying system architecture.YaST will automatically choose the best version for you.
==>YaST will add the required repositories and then after finishing the installation
==>You can alternatively click on repository link and download "rpms" from the repository and install them using "zypper".
==>You can launch YaST from "Applications" in GNOME 3.X and relevant main menus in older versions.
==>The tool will sit in your notification tray.
==>By default the tool will open the definitions for any word you have selected in any tool be it a browser or application like "gedit" by pressing the key combination :- "Ctrl+Alt+W"
==>If you turn on "notify" option by right clicking on the application's icon in the notification tray,it will show the definitions as notifications instead of opening up the entire application.
Application Full Screen
Application Showing Definition as notification in GNOME 3.X
How to Start Artha along with your OS?
==>If you want to start the application along with GNOME then you need to add it to "gnome-session-properties".
==>Press key combination "Alt+F2" an type in "gnome-session-properties".
==>In the session properties windows,use add button.Give any name of your licking.In the command text-box you need to use "artha" in lower case as demonstrated below.Press "Save" button and from next boot the application will start automatically