Mac OS X comes with The New Oxford American Dictionary and The Oxford American Writer's Thesaurus built in. Mac OS X Mail makes accessing these powerful tools particularly easy.
Get Instant Access to Dictionary and Thesaurus in Mac OS X Mail
To instantly access dictionary and thesaurus in Mac OS X Mail:
- Place the mouse cursor over the desired word.
- Press Command-Ctrl-D (think define).
- To access the thesaurus, select Oxford Thesaurus from the Oxford Dictionary drop-down menu.
- To see derivatives, origins and phrases, click More....
Look Up Multiple Words in a Row
This shortcut to the dictionaries works both when you read and when you compose messages. To look up multiple words quickly, keep Command-Ctrl pressed as you move the mouse cursor over desired words (you can release the D key).
The same keyboard combination also brings up definitions in many other Mac OS X applications (e.g. Safari).

