Apple's Dictionary application is useful for grabbing information about items, either by looking them up in the dictionary or thesaurus, or by using online resources such as Wikipedia. Recently Wikipedia has undergone a few site and design changes, which have broken some of the way items are displayed in the Dictionary application.
The main problem seems to be you cannot scroll down to see additional content from the search result, and everything is truncated at the size of the current window. While you can resize the window, the content will not resize properly along with it, leaving a white gap at the bottom of the window.
Both Apple and Wikipedia have been notified about this problem, and it appears a fix will need to come from Apple updating the Dictionary application (maybe in an OS update), but meanwhile there is a fix that should work:
- Register with Wikipedia and enable the "Remember Me" feature.
- Go to the "New Features" → "Take Me Back" section.
- Fill out the survey about why you are turning off new features.
- Click the submission button.
After you do this, you should be set. Apple's Dictionary interfaces with Wikipedia through the Web and uses Wikipedia's cookies when doing so, so you should be able to save your settings for the website and have the Dictionary application use those settings.