Dictionaries and Thesauri Directory
Welcome to the Dictionaries and Thesauri Directory
Find the most trusted online dictionaries and thesauri in one place. This directory offers a curated collection of language tools to help you define words, explore synonyms and antonyms, improve vocabulary, and enhance writing skills. Whether you’re a student, writer, teacher, or language enthusiast, these resources cover general, academic, medical, legal, and multilingual dictionaries to suit all needs.
Directory and search engine for acronyms and abbreviations.
abbreviations.com – Acronyms
Provides definitions for more than five million acronyms and abbreivations.
acronymfinder.com – Acronyms
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
Builds dynamic trees that are filled with synonyms, antonyms, syntactical associations.
wordflex.com – iPad Only
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
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
