Kho khuat
Kho khuat is the third letter of the Thai alphabet. It is a high consonant in the Thai tripartite consonant system. It represents the sound as an initial consonant and as a final consonant. The letter is now rarely used, being replaced universally by kho khai. There are currently no words using kho khuat in Thai language according to the Royal Institute Dictionary of 1999, the official standard current dictionary of the Thai language. However, kho khuat still has an entry in most dictionaries stating that it is obsolete, and is included on alphabet charts in order to preserve the traditional count of 44 Thai consonants.
History
Origins
Early evidence of kho khuat can be found in the Ram Khamhaeng Inscription from the Sukhothai Period, which contains 11 words containing the letter. Additionally, there are a number of other similar inscriptions that contain the letter, including the Pa Nang Mo Inscription, the Pho Kun Ram Phon Inscription, the Kam Phaeng Ngam Inscription, and the Sadaeng Phon Kam Nam Su Nipphan Inscription.Linguists believe that at the time kho khuat likely represented the velar fricative and was originally distinguished from kho khai, which represents . Cognates of words beginning with kho khai and kho khuat in other Tai languages, such as Tai Dón, also consistently show different sounds. Later on, kho khuat gradually came to sound the same as kho khai, evidence of which may be seen from later inscriptions beginning to mix up the two letters.