The Oxford Dictionary of English Etymology is the most comprehensive etymological dictionary of the English language ever published. It is based on the original edition of The Oxford English Dictionary but much augmented by further research on the etymology of English and other languages. Providing a fascinating insight into the development of English, it describes 38,000 words in 24,000 articles.
Example: LAW - rule [OIcel] - layer, partnership, fixed price, set tune, and "in various languages, "derived from bases meaning 'place, set down'.
KEY - OFris. Kei, kay; of unknown origin.