VocaBoca for Android - VocaBoca is a vocabulary builder for Android. The app allows you to easily create lists with words to learn when browsing the net, reading news or checking email
Vocalicious - Vocalicious is a vocabulary builder for Android. It is designed for people who have little time at their disposal and need to improve their vocabulary, prepare for GRE/GMAT exams or just want to learn new words.
The app has a built-in list containing 100 words along with their pronunciation
Webster's New World College Dictionary (Android) - The most useful and authoritative dictionary you can own, this dictionary is selected by leading newspapers as their official dictionary of choice. Ten years of lexicographic research culminates to form the latest edition of the renowned Webster's New World College Dictionary
Webster's New World College Dictionary and Roget's A-Z Thesaurus (Android) - The most useful and authoritative dictionary you can own, the Webster's New World College Dictionary is selected by Associated Press, the Wall Street Journal, the New York Times, and other leading newspapers as their official dictionary of choice
Webster's New World Roget's A-Z Thesaurus (Android) - The thesaurus that works hardest for you, Webster's New World Roget's Thesaurus opens up the world of words and leads you to more precise and more effective communication
Webster's Thesaurus TR - The thesaurus that works hardest for you, Webster’s New World Roget’s Thesaurus opens up the world of words and leads you to more precise and more effective communication
Webster's Third New International Dictionary, Unabridged for Android is America's foremost publisher of language-related reference works. The company publishes a diverse array of print products. Dictionary making at Merriam-Webster has always been an ongoing process. Even as the 1859 edition was being published, editorial work on a completely new edition was under way
WordStash.com - Firefox Addon - WordStash can be described as half flash card, half dictionary and a new breed of dictionary that provides you with interactive tools to learn the words that you lookup