Reverse dictionary is a tool that helps you find the right word by starting with a definition or description of the concept you want to express. Unlike traditional dictionaries that are organized alphabetically by word, reverse dictionaries allow you to input a phrase or description and receive a list of words that match the meaning. This can be especially helpful when you have a specific idea in mind but can't remember the exact word you want to use. By using a reverse dictionary, you can quickly and easily find the right word to convey your intended meaning.