MooT The game of grammar, semantics, and etymology. Play online the game that investigates the history and meaning of English words.
Focusing on Words An advanced Latin-Greek-English vocabulary source of etymologies with thematic units of roots, prefixes, and suffixes, and vocabulary quizzes.
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.
Oxford English Dictionary Presents a word a day complete with pronunciation, spellings, etymology, quotations and date chart.
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.
Exploring English Words Exploring English words that are derived from Latin and Greek sources with etymologies and vocabulary activities.
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.
Altaic Etymology Online database version of the Altaic Etymological Dictionary by S. Starostin, A. Dybo and O. Mudrak.
Word Sources Includes a searchable database of Latin and Greek roots and affixes, a free newsletter, and links to other sites.
European Sayings & Idiomatic Expressions Dedicated to gathering sayings and idioms and their translation/explanation from all over Europe. User contributions welcome.
Online Etymology Dictionary History and evolution of more than 30,000 words, including slang and technical terms.
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.
The Phrase Finder The meanings and origins of thousands of English phrases and sayings. Also contains a discussion forum to ask a panel questions on the meaning and origin of phrases.
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.
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.