Onelook.com offers dictionary search better than Google's

As a writer, I often have to look words up. For years, Onelook.com has been my go-to tool. Whenever I need to look up a word, I use Onelook to directly search dozens of dictionaries, both plain English and specialized. The results page links directly to the entry I looked up in each dictionary, and getting multiple definitions is just a matter of Ctrl-clicking each of my favorite dictionaries to open them up in new tabs.

The service searches established dictionaries such as Merriam Webster, Encarta and American Heritage, as well as much more obscure sources such as The White House's Drug Policy Street Term glossary. Each resource is categorized, so if you're looking for the drug-related definition for "finger" you can immediately skip down to Slang section in the results.

Another useful feature is the "reverse dictionary lookup" which lets you look up a word by its meaning. It's a very no-frills website, but it gets the job done better than Google's "Define" search each and every time. If only it had an API ...