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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.

Abbreviations.com

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

Answers.com

Aggregator of definitions, encyclopedia entries, and language translations.

reference.answers.com - Aggregator

Cambridge

Search multiple dictionaries from Cambridge University Press.

dictionary.cambridge.org

Computer Definitions

Featuring 20,000 topics and 2,500 images. Search field at bottom of page.

www.computerlanguage.com - Computers

Definitions.net

Multilingual dictionary that provides definitions and translations.

definitions.net - Aggregator - Also see: Synonyms.net

Dictionary.com

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

Macmillan

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

OneLook

Meta-search tool indexing 13 million words from 1,000 dictionaries.

www.onelook.com - Also see: OneLook Reverse Dictionary

Oxford Dictionaries Online

Oxford's Compact English Dictionary contains 145,000 words and definitions.

oxforddictionaries.com - Dictionary

Thesaurus.com

Over 17,000 entries. Find synonyms, antonyms, and brief definitions.

http://thesaurus.com/ - Thesaurus

The Free Dictionary

General and subject dictionaries for financial, legal, and medical terms.

www.thefreedictionary.com

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

Vocabulary.com

Outstanding dictionary and engaging vocabulary teaching tool.

vocabulary.com - Dictionary, Learning

WebMD Medical Dictionary

Thousands of medical entries from abdomen to zygote.

dictionary.webmd.com - Medical

Webopedia

Dictionary of computer and Internet terms.

www.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.

www.wordspy.com

Wordnik

Aggregator of definitions, images, and word usage statistics.

www.wordnik.com - Aggregator

YourDictionary

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

RhymeZone

Writing tool for poetry, song lyrics, greeting cards, and more.

www.rhymezone.com - Rhymes

WordCount

Artistic experiment that presents 86,800 English words, ranked in order of frequency.

www.wordcount.org

Wordle

Java-based word cloud generator. Customizable fonts, layouts, and color schemes.

www.wordle.net - Collages

Write Rhymes

Simple online notepad with rhyme suggestions for poets.

www.writerhymes.com - Rhymes