Anyone know an extension that adds a "lookup word" to the context menu for selected word? Doesn't need to be locally defined. It can show a definition from the internet, but I'd prefer it if it showed in in a native dialog box or something similar rather than a search engine. Needs to be Linux compatible.
Artha is a free dictionary add-on for Linux that integrates with most applications. It is available from Sourceforge, or in the Ubuntu software repo.