Oxford Dictionary of English Etymology

For each entry, the dictionary provides the correct pronunciation, followed by a short definition, and the century and source of the word's first recording. Then come the etymological notes. Thus one learns that "froth" (an aggregation of small bubbles on liquid) was first noted in the 14th century, in Sir Gawain and the Bible, that it comes from the Old Norse frooa, and was taken from there into German (fraup) and Old English (froth). Now in its fifth printing and a standard reference for scholars, Onions's opus is still the most comprehensive etymological dictionary of English ever to be published. --Stephanie Gold