Shortcut for Finding a Definition

                 Hmmmm.  What does this word mean?  Yes, you can go over to the Dictionary in your long-long list of icons there on the side of the screen.  But this morning Ruth Davis' emailed tip says to   "Hover your mouse cursor over top of the word you'd like to look up and press Command + Control + D. A dialog will then pop up with the word defined by the build-in Mac OS Dictionary."  The little box also lists some words from Thesaurus and Wikipedia.
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