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Online Dictionaries and Thesauri

  • Cambridge
    Search multiple dictionaries from Cambridge University Press.
    dictionary.cambridge.org
  • Dictionary.com
    Includes definitions from , Random House, and Merriam-Webster.
    dictionary.com – Aggregator – Also see: Thesaurus.com
  • Thesaurus.com
    Over 17,000 entries. Find synonyms, antonyms, and brief definitions.
    thesaurus.com – Thesaurus
  • Abbreviations.com
    Directory and search engine for acronyms and abbreviations.
    abbreviations.com – AcronymsAlso see: Definitions.net
  • Acronym Finder
    Dictionary of acronyms and abbreviations. Contains over 750,000 definitions.
    acronymfinder.com – Acronyms
  • Computer Definitions
    Featuring 20,000 topics and 2,500 images. Search field at bottom of page.
    computerlanguage.com – Computers
  • Definitions.net
    Multilingual dictionary that provides definitions and translations.
    definitions.net – Aggregator – Also see: Synonyms.net
  • Investor Words
    Financial glossary with a comprehensive index of 7,500 definitions.
    investorwords.com – Financial
  • Law.com Dictionary
    Concise, easy-to-read definitions from The People's Law Dictionary.
    dictionary.law.com – Legal
  • Macmillan
    British English and American English dictionaries.
    macmillandictionary.com – Dictionary
  • Mathworld Dictionary
    Source of mathematical definitions and concept explanations.
    mathworld.wolfram.com – Math
  • Medi Lexicon
    Search over 200,000 medical terms, ICD-9 codes, hospitals, and more.
    medilexicon.com – Medical
  • Merriam Webster
    Based on the print version of Merriam-Webster's Collegiate Dictionary.
    merriam-webster.com – Dictionary
  • Merriam Webster Visual Dictionary
    6,000 full-color images; 20,000 terms with contextual definitions.
    visualdictionaryonline.com – Dictionary
  • Net Lingo
    Definitions for thousands of terms in the field of technology and communication.
    netlingo.com – Technology
  • OneLook
    Meta-search tool indexing 13 million words from 1,000 dictionaries.
    onelook.com – Also see: OneLook Reverse Dictionary
  • Oxford Dictionaries Online
    Oxford’s Compact English Dictionary contains 145,000 words and definitions.
    oxforddictionaries.com – Dictionary
  • The Free Dictionary
    General and subject dictionaries for financial, legal, and medical terms.
    thefreedictionary.com
  • Urban Dictionary
    Dictionary of contemporary American slang. Not appropriate for children.
    urbandictionary.com – Slang
  • Visual Thesaurus
    Displays a unique visualization of connections between words.
    visualthesaurus.com – Thesaurus
  • Vocabulary.com
    Outstanding dictionary and engaging vocabulary teaching tool.
    vocabulary.com – Dictionary
  • WebMD Medical Dictionary
    Thousands of medical entries from abdomen to zygote.
    dictionary.webmd.com – Medical
  • Webopedia
    Dictionary of computer and Internet terms.
    webopedia.com – Technology
  • Wiktionary
    Multilingual dictionary and thesaurus written and edited by the public.
    en.wiktionary.org – Dictionary
  • Word Spy
    Blog tracking new words and phrases in popular use.
    wordspy.com
  • Wordnik
    Aggregator of definitions, images, and word usage statistics.
    wordnik.com – Aggregator
  • YourDictionary
    Definitions, thesaurus entries, spelling, pronunciation, and etymology results.
    yourdictionary.com – Aggregator