I saw goosh the other day, which is a prototype pseudo-commandline interface to the web. It seemed to be missing a dictionary lookup function, but did appear to have an extension load function.
To try this out, go to goosh and type:
Then, use the
dict command (or
d as listed in the help) to open the wiktionary page for the given word in a new window.
Perhaps there will be a way to load a goosh extension in a persistent way so you don't have to reload it every time you reload goosh itself.