How to disable three-finger tap word lookup? Just upgraded to Mac OS X Mountain Lion, and I'm loving it so far.

One thing I don't care for though is that now, three-finger tapping links—or anything, for that matter—brings up popups with the definition of the word that was tapped.

This is less than convenient since I'm using MiddleClick to set that particular tap gesture to act as a middle-click.

Is there any way that I can disable this behavior?
In System Preferences under Trackpad then Point &amp; Click, uncheck Look up.