BlueDict is the best app shell for multi-dictionaries . The app is only a shell, It only supports mdx format dictionaries. Besides mdx, You need 1)mdd for images and sounds 2)css and js for styling and other function. You can switch the dictionaries within the shell. It is super fast with hundreds of dictionaries loaded.
E-book reader can be integrated with bluedict search in pop-up mode . You can fuzzy search and full text search. This app has "word jump" function in which you can click any word in the app to search the word.
NOTES: You should put mdx files into folder : BlueDict>Dicts . Or in setting you can choose the path of the folder ,then you can use it.