Look up words in the Visuwords online graphical dictionary and thesaurus to find their meanings and associations with other words and concepts. Produce diagrams reminiscent of a neural net. Learn how words associate.
The Skeptic's Dictionary began with fewer than 50 entries in 1994 and has grown to more than 500 entries in 2007. Each month, the site gets about a million visitors and processes about 1.5 million page views. Thousands of readers have e-mailed comments, suggestions, and criticisms. In response, I've added many new entries since the first "printing." Many reader comments have been posted. Thanks to alert readers, numerous errors have been corrected.
The Indogermanisches Etymologisches Wörterbuch (Wikipedia) by the Jewish-Czech scholar Julius Pokorny was published in 1959. The work is now slightly outdated, especially as it was conservative even at the time Pokorny wrote it, ignoring the laryngeal theory, and hardly including any Tocharian or Anatolian material. But there exists no more modern and updated etymological dictionary of the Indo-European languages, so it is still of interest to scholars.