If you use an e-reader or tablet, you probably enjoy the ability to click on a word and see a pop-up definition. This is a great feature that makes e-readers preferable to books for many readers.
Now you can enjoy the same feature as you browse online. Dictionary.com has released a Google extension that enables users to highlight a word (double click) and see a definition right away. I've tried this out and I love it! If you use Google Chrome, you can add the extension in a few seconds. It's great for online research!