Search multiple dictionaries, reverse dictionary lookup (describe a concept and get a list of words), wildcard searching. Searches online encyclopedias as well as dictionaries. As at July 2010 – over 18 million words and over 1,000 dictionaries indexed.
Handy dictionary site, allows wildcard searches, reverse dictionary, etc. – post by Nbr
This site allows you to search 931 online dictionaries from a single search box. It sounds like a complication but it’s not; it actually simplifies the task of finding the meaning of words. – post by Andreas
Does reverse dictionary searches, type in a concept and it will give you terms related to it. – post by Pistos Christou