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Wiktionary (en)
Search Wiktionary.org, the free-content multilingual dictionary quickly and easily - and without wasting time and bandwidth on ads.
WikiLook Requires Restart
Leading dictionary lookup add-on. Fast, light, open source tool that define words for you without need to open new tabs or windows. Wiktionary&Wikipedia.
Ctrl or Shift or Alt + RightMouseButton click. Now with thesaurus.
70+ languages supported!
To create your own collections, you must have a Mozilla Add-ons account.