Inline Google Definitions : Firefox Add-on
Inline Google Definitions is an essential Firefox add-on, which shows inline definitions for a word or phrase.

I love another handy Firefox add-on AQwikwiki, which shows definitions from Wikipedia. But, this add-on uses Google’s database to show definitions for words.
Install this add-on, select the word or phrase and right click on it to see the definitions. Short summary of definitions pop-up and you can choose to see the full page view.
A useful add-on to increase your productivity, specially if you are a student or researcher.
Link : Inline Google Definitions – Firefox add-on
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