LEXiTRON is a free Thai <-> English dictionary produced by NECTEC. Its dictionary data files have been used and adapted by several websites and other software programs. Version 2.0 includes two plain text files files (telex and etlex) that contain Thai to English and English to Thai translations respectively.

A sample entry from telex is shown below.
<Doc>
<tsearch>ห้องสมุดประชาชน</tsearch>
<tentry>ห้องสมุดประชาชน</tentry>
<eentry>public library</eentry>
<tcat>N</tcat>
<tsample>กรุงเทพมหานครให้งบประมาณสร้างห้องสมุดประชาชนขึ้นทั่วกรุงเทพ 20 แห่ง</tsample>
<tdef>ห้องสมุดสำหรับประชาชน</tdef>
<id>753</id>
</Doc>
To view or edit the data files you will need a program that can work with large text documents. Do not try to use Microsoft Windows Notepad - it will almost certainly crash!
Download: LEXiTRON v.2.0 data files (includes license agreement)
File size: 5,908,365 bytes
Comments
Converting Thai dictionary data files
You don't mention which database you plan to use, but you'll almost certainly need to edit/convert the files before they can be imported into a database. You can do this yourself or download files I converted last year. The converted files are formatted as XML documents and can be imported into Microsoft Access database program.
Importing into database
I've downloaded the files and managed to open them in a text editor. I'd like to import the dictionary files into a database. Any ideas how I can do this?
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