Thanks to Yuly for pointing out this powerful toolkit allowing wildcard searches and including a reverse dictionary. OneLook contains "19,044,271 words in 1062 dictionaries indexed" (home page, bottom line, 2011.01.28). It sub-divides long lists of hits into categories: "General, Art, Business, Computing, Medicine, Miscellaneous, Religion, Science, Slang, Sports, Tech, [and] Phrases."
Look up words in the Visuwords online graphical dictionary and thesaurus to find their meanings and associations with other words and concepts. Produce diagrams reminiscent of a neural net. Learn how words associate.
Look up words in the Visuwords online graphical dictionary and thesaurus to find their meanings and associations with other words and concepts. Produce diagrams reminiscent of a neural net. Learn how words associate.
Fantastic web app to use for ESL classes because it is so much more than a traditional dictionary...
"What is Wordnik?
Wordnik wants to be a place for all the words, and everything known about them.
Traditional dictionaries make you wait until they've found what they consider to be "enough" information about a word before they will show it to you. Wordnik knows you don't want to wait-if you're interested in a word, we're interested too!
Our goal is to show you as much information as possible, just as fast as we can find it, for every word in English, and to give you a place where you can make your own opinions about words known.
By "information," we don't just mean traditional definitions (although we have plenty of those)! This information could be:
* An example sentence-even if we've only found one sentence for a word, we'll show it to you. (And we'll show you where the sentence came from, too!
* Related words: not just synonyms and antonyms, but words that are used in the same contexts. (For instance, cheeseburger, milkshake, and doughnut are not synonyms, but they show up in the same kinds of sentences.)
* Images tagged by our friends at Flickr: want to know what a "pout" looks like? We'll show you.
* Statistics: how rare is "tintinnabulation"? Well, we think you'll see it only about once a year. "Smile"? You might see that word many times, every day.
* An audio pronunciation-and you can record your own!
* Something YOU tell us! Use the "Contribute" links to tell us something-anything-about a word.
A truly amazing flash based interactive and animated maths dictionary. The entries are clear and the explanations are well written that they are almost a lesson in themselves. A must for any maths teacher.
http://ictmagic.wikispaces.com/Maths