Dictionaries and Thesauri
RefSeek's guide to the 30 best online dictionaries, thesauri, and definition aggregators. Listings are judged by authority, coverage, usability, and utility.
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Directory and search engine for acronyms and abbreviations.abbreviations.com - Acronyms -
Provides definitions for more than five million acronyms and abbreivations.acronymfinder.com - Acronyms -
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Dictionary and encyclopedia including 25,000 entries and 6,000 images.computerlanguage.com - Computers -
Aggregates definitions from multiple respected dictionaries.definitions.net - Aggregator - Also see: Synonyms.net -
Includes definitions from American Heritage, Random House, and Merriam-Webster.dictionary.com - Aggregator - Also see: Thesaurus.com -
Concise, easy-to-understand definitions from The People's Law Dictionary.dictionary.law.com - Legal -
English and Spanish dictionary and thesaurus from Oxford University Press.lexico.com - Dictionary -
British and American English dictionary and thesaurus.macmillandictionary.com - Dictionary -
Source of mathematical definitions and concept explanations.mathworld.wolfram.com - Math -
Based on the print version of Merriam-Webster's Collegiate Dictionary.merriam-webster.com - Dictionary -
6,000 full-color illustrations; 20,000 terms with contextual definitions.visualdictionaryonline.com - Dictionary -
Definitions for thousands of terms in the field of technology and communication.netlingo.com - Technology -
Explanations of what our words meant and how they sounded hundreds of years ago.etymonline.com -
Aggregator of medical definitions for 10,000+ medical concepts with images and pronunciations.openmd.com - Also see: Medical Abbreviations -
General and subject dictionaries for financial, legal, and medical terms.thefreedictionary.com -
Over 17,000 entries. Find synonyms, antonyms, and definitions.thesaurus.com - Thesaurus -
Dictionary of contemporary American slang. Not appropriate for children.urbandictionary.com - Slang -
Displays a unique visualization of connections between words.visualthesaurus.com - Thesaurus -
Outstanding dictionary and engaging vocabulary teaching tool.vocabulary.com - Dictionary -
Easy-to-understand definitions for thousands of technology terms and acronyms.webopedia.com - Technology -
Multilingual dictionary and thesaurus written and edited by the public.en.wiktionary.org - Dictionary -
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Builds dynamic trees that are filled with synonyms, antonyms, syntactical associations.wordflex.com - iPad Only -
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Dictionaries, word tools, and an amazing illustrated dictionary for children.wordsmyth.net - Also see: Illustrated Dictionary for Kids -
Definitions, thesaurus entries, spelling, pronunciation, and etymology results.yourdictionary.com - Aggregator
Word Tools
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Find answers to crossword puzzles, anagrams and cryptograms.oneacross.com - Crosswords -
Explore and compare the popularity of words over time and geography based on Google search data.trends.google.com -
Remarkable, robust anagram lookup service from Wordsmith.wordsmith.org - Anagrams -
Excellent rhyming dictionary with phonetic word search, thesaurus, and near rhymes.rhymedesk.com -
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