Ever wish you could quickly lookup a word in a dictionary while you’re reading some online site or in an email you’ve received from your boss (who’s obviously received one of those Word-A-Day calendars as a gift)? Well, thanks to Tiger’s built-in dictionary and thesaurus, you can. All you need to do is:

  • Move your mouse over a word, and hold down Control-Command-D
  • A dictionary pop-up window appears, showing you a full dictionary-style definition for the word beneath the mouse pointer.
  • If you continue to hold down the Control and Command keys, you can move the mouse around within that window to scroll through the definition, or to change from using the Oxford Dictionary to the Oxford Thesaurus
  • Continue holding those keys down and try moving your mouse around the page to another word. As you move the mouse over other words, the dictionary window follows along, displaying the definition for whatever word is beneath the mouse pointer.