This etymological dictionary gives the origins of some 20,000 items from the modern English vocabulary, discussing them in groups that make clear the connections between words derived by a variety of routes from originally common stock. As well as giving the answers to questions about the derivation of individual words, it is a fascinating book to browse through, and includes extensive lists of prefixes, suffixes, and elements used in the creation of new vocabulary.
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http://usafiles.net/1rCu/Origins_A_short_etymological_dictionary_of_modern_English.pdf