Is there a way to add dictionary sources on OSX's dictionary?

Was there a way to add other dictionary sources other than provided ones on OSX's dictionary application?

It has been very useful so far to translate from English to other languages, as well as looking up thesaurus and such, but it would be wonderful to add (some sort of kind like a) third party url's to the app, so I can quickly search these words from trackpad gesture.

Please help if you know how! Very much appreciated!