An experiment that is it possible to parse wiktionary.org's dump to build an english-something dictionary. I'm interested in Thai, so this is what you can see here.

1. Download enwiktionary-latest-pages-articles.xml.bz2 from here (more than 200MB): dumps
2. Uncompress it (more than 2GB)
3. Move it to the project folder as wiktionary-full.txt
4. Run npm install to install the lazy module. If you already installed, than skip this step.
5. Run node parse_wiktionary.js
6. It creates the file dict-th.js in about 6 minutes in my machine.