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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?

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@jaberg: The only problem I have with that title is that I specifically want to use the "Look up" feature of Lion, rather than the "Look Up in Dictionary" service which was available in many versions of OS X. – Senseful Mar 28 '12 at 17:45
You're always free to roll back an edit. FWIW, the keyboard shortcut worked pre-Lion and this feature is a new look applied to an old friend. Cheers! – jaberg Mar 28 '12 at 17:51
@jaberg: I still see the old feature available in Lion though, which is what could make it confusing. I agree that the original title looked awkward, I just can't think of a good way to phrase it. – Senseful Mar 28 '12 at 17:52
up vote 6 down vote accepted

From this:

For years, Mac OS X has had a great shortcut for getting a quick definition of a word: Simply hover the cursor over the word, and press the keyboard shortcut Command-Control-D to bring up a little Dictionary popup. This still works in Lion, but it’s now much more fully featured and also has a great new way to access it.

Your looking for Cmd+Ctrl+D

PS: Thanks for asking, it actually made me look and learn something new

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+1 answer. Learned something great! – bassplayer7 Mar 28 '12 at 18:33
+1. Does not work in all apps, though (e.g. not in Firefox). – Thilo Mar 29 '12 at 1:43
It works in all Apps that use the system text APIs. Firefox apparently doesn't. – jaberg Mar 29 '12 at 6:56

Have you tried right clicking…

enter image description here

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