A far superior way would be in my opinion to use a software like Transfz which can be accessed through a simply keyboard hotkey from any application or document on your computer. The hotkey opens a menu with several standard sites that you can use to lookup the word. Sites include Google, Yahoo, Wikipedia and even Youtube.

It is furthermore possible to add custom sites to the menu which means that you can add your favorite web service to the list as well. Instead of pressing a hotkey to open the menu you can also assign hotkeys to search engines speeding up the process just a bit more that way.

Transfz extends the clipboard as well giving you access to the latest 5-30 phrases that have been copied to it. It has some text manipulation options as well such as converting upper and lower case chars, replacing phrases and lots more.

This is a great freeware for everyone who is working with texts.