Kibbles subscriber Josh M. sent in the following tip, after reading Mac Treat #82 “How to Remove Custom Dictionary Entries”:
A shortcut to check a definition (rather than editing an entry, which is what you were focussing on) is to place your cursor over a word, and click Command-Control-D. After a second’s hesitation, a drop-down window appears with a brief and usually helpful definition. You can even switch to thesaurus view! It works in any Apple program like Mail or Safari or Pages; not sure about non-Apple programs.
The only downside is that if you accidentally substitute Shift for Control (Command-Shift- D) in Mail, you will trigger an unintentional and premature sending of your draft. This can be embarrassing if you aren’t quite ready to have your message read!
Submitted by Josh M. Thanks Josh!