I have something to share with you. I think it's cool.

It's a chrome English-English dictionary extension. You can get it here...
https://chrome.google.com/webstore/detail/mgijmajocgfcbeboacabfgobmjgjcoja

Installation
Just click on link and click on "ADDED TO CHROME" in that page. (It's only use for chrome browser)

Using
When you double click on word or highlight on word, this extension will popup a window that has meaning of that word (It's helpful). And has dictionary icon on top-right of chrome browser, you can click it and search some word meaning.