List of online dictionaries. An online dictionary is a dictionary that is accessible via the Internet through a web browser. They can be made available in a number of ways: free, free with a paid subscription for extended or more professional content, or a paid-only service. Some online dictionaries are organized as lists of words, similar to a glossary, while others offer search features, reverse lookups, and additional language tools and content such as verb conjugations, grammar references, and discussion forums. Selected online English dictionaries Shahi - A visual dictionary. Urban Dictionary, April 22: carbon cockprint. Wordnik: All the Words. Free Online Dictionary for English Definitions. Lingro: The coolest dictionary known to hombre!