EC Boston recommends: An extraordinary free on line dictionary and thesaurus!
Why Memidex? 
Memidex is a free online dictionary and thesaurus
Memidex reaches a new total of 12.5 million external reference links, including over 5.4 million definition references, 5.3 million audio references, and 1.8 million etymology references.
Each audio reference has a button to play the audio directly from the Memidex web page.
Make your Study Time more Effective!
