Wordnik – An online dictionary aiming to collect all the words in the English language. (more…)

Twittonary is an easy way to learn about various Twitter related words, which in turn classifies it as a Twitter dictionary. (more…)

NinjaWords is a fast, accurate, and smart online dictionary. (more…)

Lexipedia is a great language tool that visually displays, the nouns, verbs, adverbs, adjectives, fuzzynyms, synonyms, and antonyms of any word you type in the search box, all displayed on a single page. (more…)

Definr.com is a fast, free dictionary based on Princeton’s open WordNet 2.0.

The website framework is Ruby on Rails. Looking up words in a dictionary is easy, so we do that with MySQL and cache the top 10,000 definitions in memory. (more…)

Ajax dictionary and thesaurus.

A free online pronouncing dictionary with Instant Sound. American and British spellings, with alternative pronunciations. Sounds are fast, clear and completely natural, pre-recorded by native speakers. Answers the question “How do you say…?”. Also referred to as a pronunciation dictionary.