You can add references to online dictionaries in your post with easy using Post2Blog

You can set reference for selected words to Answers.com, Google, Flickr, Wikipedia, Yahoo, Technorati and other.

Example:

Select word or phrase in Post2Blog editor and right-click on it. Select Create Link to web-service command

Select web-service and click OK

Now selected phrase is linked to the online Wikipedia article about Apple iPod