Fora Reader v3   
dictionary reinvented   

Below are some screenshots of Fora Reader in action. Though they are taken on a Windows computer, Mac OS X and Linux functionality is identical except respective look and feels.

Browser window
Browser window features integrated dictionary.

Multiple-panel dictionary tab
Flexible dictionary views let you leverage productivity

Dictionary window
Cross-lookup couples all your dictionaries together

Split panels integrate browser and dictionary
Split panels provide integrated dictionary view

Dictionary manager
Dictionary manager gives you complete control over your dictionaries

Background mode
Background mode continuously monitors clipboard and captures words to translate