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SnappyWords Visual Dictionary
Snappy Words is a Free Interactive English Dictionary and Thesaurus that allows you to finding meaning of words and other associated words in a visually interactive display. Lookup a word and see other related words of main query, each with meaning.
Smart Define Search
Add Smart Define to Firefox's search bar. Get a quick access to smartdefine.org dictionary and thesaurus when you need to find the best definitions and word meanings.
To create your own collections, you must have a Mozilla Add-ons account.