The Französisches Etymologisches Wörterbuch (German for French Etymological Dictionary) or FEW is the principal etymological dictionary of the Gallo-Romance languages (such as French).
It was the brainchild of the Swiss philologist Walther von Wartburg.
[1] The first edition of the FEW, written in German, was started in 1922, with the objective of tracing the origin, history and change of all words in the French lexicon, including Gallo-Romance languages: Occitan, Arpitan / Francoprovençal and Walloon.
Since 1952, the Swiss National Science Foundation has supported this ambitious project, with the help of the French National Centre for Scientific Research (CNRS) since 1983.
There is a much-abridged version, the Dictionnaire étymologique de la langue française, published by the Presses universitaires de France.