LEXiTRON ™ (เล็กซิตรอน) is a Thai <-> English dictionary produced by the National Computer and Electronics Center, Thailand (NECTEC). There are two versions of the dictionary (sound / no sound) that you can download and install for free.
LEXiTRON is maintained by Thai staff and its users can suggest new words and definitions. This may explain how some of the more unusual words, spellings and sometimes vulgar slang has worked its way into the dictionary. Nonetheless, for a free dictionary the overall quality is quite reasonable.
Download LEXiTRON 2.6
Download: LEXiTRON 2.6 Setup (no sound)
File size: 47.9 MB
MD5 checksum: 97f2d8e707f364e6c1a19ea9cafa4004
Download LEXiTRON 2.6 with sound
Download: LEXiTRON 2.6 Setup (with sound)
File size: 598.6 MB
MD5 checksum: 73980b0b8d78e5ed88496d99adb21505
A note for software developers and lexicographers
Previous versions of LEXiTRON store the dictionary data in plain text files, but LEXiTRON 2.6 stores its data using Apache Derby, a Java relational database management system. After we installed and configured Apache Derby on one of our test computers, we were able to query the LEXiTRON 2.6 database using SQL commands.
The dictionary data files have been used by many websites and dictionary programs.

Thanks. Works perfectly.
You’re welcome. We just moved across to this new website and it’s good to have some positive feedback.
I wonder why I can’t use it for ever like other program , Dictionaries
What do you mean?
This is the full version and most users have been able to install it without problem on Windows XP. What operating system are you using?
ขอบคุณมากๆครับ
ขอบคุณคับ
Thank you very mach…
No problem, Nan. You’re very welcome.
txns a lot
thanks alot
ดีมากครับ เพิ่งได้โหลดมาลองใช้ดู เคยใช้ชุดของ ส. เสถบุตร ซึ่งต้องเสียเงิน และไม่ค่อยเวิร์ค คำศัพท์บางคำก็ไม่มี ผมลงกับ Windows 7 x 64 บิท ยังไม่เจอปัญหาครับ แต่ยังไม่ได้ใช้จริงจัง
That’s great news! I’m glad that it works for you on the 64 bit edition of Windows 7.
Are you sure about that? I want to upgrade to Windows 7.
Do you have this programme for someone like me,who is not familiar with the Thai alphabet?
Sorry, but we don’t. Dictionaries that transliterate Thai words into English have a very limited use, and you’ll find that no one will be able to understand what you say. Try learning Thai — it might not be as difficult as you imagine.
มีโปรแกรมอย่างนั้น แต่ไม่ฟรี
Thank you so much
thank you
hiii i want to be ur friend if u dont mind…
Dear Admin, thank you for this precious dictionary. I used to use it on a Linux mobile phone. Is this new version still good for such o.s.? Moreover, will it work with Android too? Or maybe do you have another version for that o.s.?
Thanks in advance from Italy.
Max
Max,
This version is for Microsoft Windows only, and as such will not work unless your phone is capable of running Windows applications. There used to be an old version on the NECTEC website for Linux, but I don’t recall whether that was pre-compiled (binary version) or required you do compile it yourself. Either way, I suspect that you will have problems getting it to run on a mobile phone.
I’m still using an old Motorola Motorokr E6 Linux-based phone which has a T/E dictionary installed. I believe this uses the data set from the NECTEC dictionary and works reasonably well. Staff in the Motorola shop installed this for me several years ago but I’m not sure whether this is still an option. Have Motorola phone shops now closed down in Thailand?
Dear Admin,
Ooh, that’s the same phone I was mentioning before! So I think we’d the same application on such mobile….
But now even that program I can’t open anymore (maybe it’s corrupted), so maybe you can help me in find where I can download it again…
Can you tell me the link?
Thank you Adm, you’re very kind.
Max
Sorry, but I don’t have a link for downloading the Motorola application which is installed on my phone.
The About menu option says “Developed by Motorola, Database Licenced by SO SETHAPUTRA” — so maybe you could use that information when searching. Otherwise, you might just arrange a trip to MBK or Pantip Plaza if that’s convenient.
thank you for download
Thank you ka
I really like this program, and appreciate all the work that has been done on it since I started using it when it was version 1.x. I just downloaded and installed 2.6 without the sound in a new Acer notebook with Windows 7 Professional, 4GB RAM and 500GB Hard Disk space. But when I tried to change the font, here is what happened.
1. I clicked Option | Font to get the Select Font dialog.
2. I customized the font settings leaving Tahoma as the default font, and increasing the font size to 20 and checking the box for bold. I also changed the font color to a dark blue. Then I clicked OK.
3. The Select Font box closed, but also popped up again, and no changes had been made in the main Lexitron window. So I repeated what I did in Step 2 above. I had to do this two more times before the the font changes actually worked.
4. When I closed the Lexitron program and reopened it, the font settings were back at the default: Tahoma Font, Font size 14, no bold, no italics, black color.
Is this a Windows 7 compatibility problem? I have not tried any legacy settings yet, or running it as administrator, although I am using an account with administrator rights.
Cheers/howiem Bangkok
Further to my last post above, I just tried uninstalling Lexitron 2.6 and reinstalling it in Windows XP SP3 compatibility mode, but the exact same problem occurred as I described above.
Cheers/howiem Bangkok
good
ขอบคุณที่ใด้ใช้ พจนานุกรมนี้ ดีแต่ มีทั่วไป ของฟรี ขอดูต่อว่าจะดีใด้อีกไหม
thank your good program
You’re welcome.
Good morning! Thank you for this free program. I am using Window 7. Do you think this dictionary will work with this operating system?
thanks
We received reports that it does work on Windows 7 but have not tried it ourselves.
ขอบคุณมากๆๆๆๆๆคับ พจนฯนี้เยียมเล้ยยยย
Thank a lot.
Thank you so much for the good dictionary. It works with Windows 7. Thank you ^^
Hi… Does this work on MAC OS???
Not unless you can run Windows programs on your system.
I have this error:
An error occurred while trying to replace the existing file: DeleteFile failed; code 5.
Access is denied.
Click Retry to try again, Ignore to skip this file (not recommended), or Abort to cancel installation.
Any suggestions, using windows 7
Danni, it works fine for me and I’m using Windows 7. Did you get the problem sorted?
i did get it installed somehow, i think i just ignored the message and went on and somehow I got it installed. all is good. thanks for the reply.
Hi there,
My name is Saemin and I work in the Biz Dev organization in Google APAC. I’m trying to reach the person who manages Lexitron’s Thai word data-base.
Would be grateful if you could contact me at ############# to discuss further.
Thank you
Saemin Ahn
Saemin, I have sent you a direct reply.