Building-Dictionary-Skills-2-3-Book-N38763_XL.jpgTag Galaxy - Amazing photos for your words
Type a word and hundreds of Flickr photos show up!

The Clean Dictionary - Uncluttered dictionary

Wordnik - Dictionary and examples of words in context

Word Hippo - Definitions,antonyms, synonyms and more

Dictionary Reference - Dictionary, thesaurus and flashcards

Visuwords - Dynamic online dictionary

Lexipedia - Another dynamic complex dictionary

Word Stash - Another useful dictionary online

Lingro - THE coolest dictionary - insert any web page and click any word - you get the definition!