Lion introduced the new "Double-tap with three fingers" to Look up, which pops up a small definition of whatever word you double-tap. Is there any way to invoke look up without the trackpad? For example, if I'm on a desktop Mac (with a normal mouse) is there any way to quickly look up a word by using this same look up feature?
Your looking for Cmd+Ctrl+D
PS: Thanks for asking, it actually made me look and learn something new