Memidex

This is the best free on line dictionary and thesaurus I have ever seen. 

As they say ,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. 

Click on this link to go to Memidex

Related Items -:Internet resources / Recursos en internet Diccionarios