noun, plural online thesauruses, online thesauri.
or dictionary of words with the same or nearly the same meanings, or synonyms, and their opposites
, or antonyms, such as Thesaurus.com,
available on the Internet or the World Wide Web, accessed through a web browser
, and used by entering a query term into a search box on the site. An online thesaurus provides immediate electronic access to lists of alternate terms for the queried word
, covering its various shades of meaning: This online thesaurus showed me that smart, as an adjective, not only means intelligent, but also stylish, or lively, and gave long lists of other words for each meaning.