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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. - Acronyms - Also see: Acronym Finder Dictionary of acronyms and abbreviations. Contains over 750,000 definitions. - Acronyms Aggregator of definitions, encyclopedia entries, and language translations. - Aggregator Cambridge Search multiple dictionaries from Cambridge University Press. Computer Definitions Featuring 20,000 topics and 2,500 images. Search field at bottom of page. - Computers Confusing Words Collection of more than 3,200 often-troublesome words. - Dictionary Multilingual dictionary that provides definitions and translations. - Aggregator - Also see: Includes definitions from American Heritage, Random House, and Merriam-Webster. - Aggregator - Also see: Investor Words Financial glossary with a comprehensive index of 7,500 definitions. - Financial Dictionary Concise, easy-to-read definitions from The People's Law Dictionary. - Legal Macmillan British English and American English dictionaries. - Dictionary MarketingPower Dictionary 4,000 cross-referenced definitions of marketing terms. - Marketing Mathworld Dictionary Source of mathematical definitions and concept explanations. - Math Med Terms Easy-to-understand explanations of more than 16,000 medical terms. - Medical Medi Lexicon Search over 200,000 medical terms, ICD-9 codes, hospitals, and more. - Medical Merriam Webster Based on the print version of Merriam-Webster's Collegiate Dictionary. - Dictionary Merriam Webster Visual Dictionary 6,000 full-color images; 20,000 terms with contextual definitions. - Dictionary Net Lingo Definitions for thousands of terms in the field of technology and communication. - Technology OneLook Meta-search tool indexing 13 million words from 1,000 dictionaries. - Also see: OneLook Reverse Dictionary Oxford Compact Oxford's Compact English Dictionary contains 145,000 words and definitions. - Dictionary Roget's Thesaurus Over 17,000 entries. Find synonyms, antonyms, and brief definitions. - 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. - Slang Visual Thesaurus Displays a unique visualization of connections between words. - Thesaurus WebMD Medical Dictionary Thousands of medical entries from abdomen to zygote. - Medical Webopedia Dictionary for computer and Internet terms. - Technology Wiktionary Multilingual dictionary and thesaurus written and edited by the public. - Dictionary Word Spy Blog tracking new words and phrases in popular use. Wordnik Aggregator of definitions, images, and word usage statistics. - Aggregator YourDictionary Definitions, thesaurus entries, spelling, pronunciation, and etymology results. - Aggregator word tools Crossword Dictionary Find answers to crossword puzzles, anagrams and cryptograms. - Crosswords Internet Anagram Server Remarkable, robust anagram lookup service from Wordsmith. - Anagrams RhymeZone Writing tool for poetry, song lyrics, greeting cards, and more. - Rhymes WordCount Artistic experiment that presents 86,800 English words, ranked in order of frequency. Wordle Java-based word cloud generator. Customizable fonts, layouts, and color schemes. - Collages Write Rhymes Simple online notepad with rhyme suggestions for poets. - Rhymes