Altaic Etymology - Online database version of the Altaic Etymological Dictionary by S. Starostin, A. Dybo and O. Mudrak.

American Dialect Society - A scholarly association dedicated to the study of the English language in North America.

Clichés and Expressions Origins - English language terms and expressions.

A Comparative Dictionary of Indo-Aryan Languages - Online version of the indexes of R.L. Turner's 1962-1985 dictionary from the Digital Dictionaries of South Asia.

Dave Wilton's Etymology Page - Devoted to etymology of common words and slang phrases.

English Language Roots: The Meanings of Word Prefixes, Suffixes and Syllables - Reference chart for Greek, Latin, and other roots of the English language. Understanding such roots can help guessing the meaning of words and creating neologisms or brand names.

Etymologic - The brain-twisting etymology game.

Etymologically Speaking - A list of some curious word origins.

Etymology - Word origins and links.

European Sayings & Idiomatic Expressions - Dedicated to gathering sayings and idioms and their translation/explanation from all over Europe. User contributions welcome.

Exploring English Words - Exploring English words that are derived from Latin and Greek sources with etymologies and vocabulary activities.

Focusing on Words - An advanced Latin-Greek-English vocabulary source of etymologies with thematic units of roots, prefixes, and suffixes, and vocabulary quizzes.

languagehat.com - Erudite blog on word origins and definitions, with dozens of links to dictionaries, commentaries, linguistic reference sites, and personal favorites of the author.

MooT - The game of grammar, semantics, and etymology. Play online the game that investigates the history and meaning of English words.

Nautical Expressions in the Vernacular - Myriad expressions in everyday English have nautical origins. This web page lists expressions and definitions mentioned by listswains, members of the Patrick O'Brian Mailing List, also known as the Gunroom.

New Words In English - Neologisms and novel uses of words in English collected by members of the class Linguistics/English 215, Words in English: Structure, History and Use, taught by Suzanne Kemmer at Rice University.

Online Etymology Dictionary - History and evolution of more than 30,000 words, including slang and technical terms.

Oxford English Dictionary - Presents a word a day complete with pronunciation, spellings, etymology, quotations and date chart.

Pandora's Word Box - Relates medical terminology to the humanities, offering a weekly overview with references to classical etymology.

The Phrase Finder - The meanings and origins of thousands of English phrases and sayings. Also includes a discussion forum to ask a panel questions on the meaning and origin of phrases.

Richard Lederer's Verbivore - Linguistic fun from, Richard Lederer, the best-selling author of The Word Circus and the new Sleeping Dogs Don't Lay, a helpful guide for grappling with vexing grammar questions.

Roots of English - An etymological dictionary you can download by Prof. Eugene Cotter, Seton Hall University.

Sayings and Everyday Expressions - Your online source for the sayings and expressions you use everyday. Search for their meaning, history and origin, find sayings, expressions, phrases, quotations, cliches, unusual words, and wordplay.

Take Our Word for It - Weekly etymology magazine.

What's The Meaning of This? - The origins of quirky English words and phrases like "In like Flynn" and "blackmail."

Word and Phrase Origins - Directory. Part of the Internet Public Library. Describes books and web sites that might be helpful. Offers a hint on how to use an ordinary search engine when looking for etymology.

The Word Detective - Words and language in a humorous vein. The online version of The Word Detective, a newspaper column answering readers' questions about words and language. Written by Evan Morris.

Word Quests for Word Seekers - Searchable dictionary of word origins, organized in cross-referenced thematic lists by Latin and/or Greek roots. English entries are also defined.

Word Sources - Includes a searchable database of Latin and Greek roots and affixes, a free newsletter, and links to other sites.

Word Spy - Collection of recently coined words, existing words that have enjoyed a recent Renaissance, and older words that are now being used in new ways.

Words with Heathen Origins in the Scriptures - An etymological study of numerous words used in churches and Scriptures that have their origin in pagan religions.

World Wide Words - Michael Quinion writes about International English from a British viewpoint. Hundreds of pages on the history, origins, evolution and idiosyncrasies of English, with features on new words and words in the news.