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.
Directory and search engine for acronyms and abbreviations.
abbreviations.com - Acronyms - Also see: Definitions.net
Acronym Finder
Dictionary of acronyms and abbreviations. Contains over 750,000 definitions.
www.acronymfinder.com - Acronyms
Aggregator of definitions, encyclopedia entries, and language translations.
reference.answers.com - Aggregator
Search multiple dictionaries from Cambridge University Press.
Computer Definitions
Featuring 20,000 topics and 2,500 images. Search field at bottom of page.
www.computerlanguage.com - Computers
Confusing Words
Collection of more than 3,200 often-troublesome words.
www.confusingwords.com - Dictionary
Multilingual dictionary that provides definitions and translations.
definitions.net - Aggregator - Also see: Synonyms.net
Includes definitions from American Heritage, Random House, and Merriam-Webster.
dictionary.reference.com - Aggregator - Also see: Thesaurus.com
Investor Words
Financial glossary with a comprehensive index of 7,500 definitions.
www.investorwords.com - Financial
Law.com Dictionary
Concise, easy-to-read definitions from The People's Law Dictionary.
dictionary.law.com - Legal
British English and American English dictionaries.
www.macmillandictionary.com - Dictionary
MarketingPower Dictionary
4,000 cross-referenced definitions of marketing terms.
www.marketingpower.com - Marketing
Mathworld Dictionary
Source of mathematical definitions and concept explanations.
mathworld.wolfram.com - Math
Med Terms
Easy-to-understand explanations of more than 16,000 medical terms.
www.medterms.com - Medical
Medi Lexicon
Search over 200,000 medical terms, ICD-9 codes, hospitals, and more.
www.medilexicon.com - Medical
Merriam Webster
Based on the print version of Merriam-Webster's Collegiate Dictionary.
www.m-w.com - Dictionary
Merriam Webster Visual Dictionary
6,000 full-color images; 20,000 terms with contextual definitions.
visual.merriam-webster.com - Dictionary
Net Lingo
Definitions for thousands of terms in the field of technology and communication.
www.netlingo.com - Technology
Meta-search tool indexing 13 million words from 1,000 dictionaries.
www.onelook.com - Also see: OneLook Reverse Dictionary
Oxford Compact
Oxford's Compact English Dictionary contains 145,000 words and definitions.
www.askoxford.com - Dictionary
Roget's Thesaurus
Over 17,000 entries. Find synonyms, antonyms, and brief definitions.
thesaurus.reference.com - Thesaurus
The Free Dictionary
General and subject dictionaries for financial, legal, and medical terms.
Urban Dictionary
Dictionary of contemporary American slang. Not appropriate for children.
www.urbandictionary.com - Slang
Visual Thesaurus
Displays a unique visualization of connections between words.
www.visualthesaurus.com - Thesaurus
WebMD Medical Dictionary
Thousands of medical entries from abdomen to zygote.
dictionary.webmd.com - Medical
Dictionary for computer and Internet terms.
www.webopedia.com - Technology
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.
Aggregator of definitions, images, and word usage statistics.
www.wordnik.com - Aggregator
Definitions, thesaurus entries, spelling, pronunciation, and etymology results.
www.yourdictionary.com - Aggregator

word tools

Crossword Dictionary
Find answers to crossword puzzles, anagrams and cryptograms.
www.oneacross.com - Crosswords
Internet Anagram Server
Remarkable, robust anagram lookup service from Wordsmith.
wordsmith.org/anagram - Anagrams
Writing tool for poetry, song lyrics, greeting cards, and more.
www.rhymezone.com - Rhymes
Artistic experiment that presents 86,800 English words, ranked in order of frequency.
Java-based word cloud generator. Customizable fonts, layouts, and color schemes.
www.wordle.com - Collages
Write Rhymes
Simple online notepad with rhyme suggestions for poets.
www.writerhymes.com - Rhymes

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