dictionary and thesaurus

noun, plural dictionary and thesauruses, dictionary and thesauri.
  1. a dictionary that includes a separate section listing terms with synonyms and antonyms. An online reference site, such as Reference.com, provides immediate electronic access to several dictionaries and a thesaurus as well as to other reference sources.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018