Thai
Concise Oxford English Dictionary © 2008 Oxford University Press:
Thai /tʌɪ/
▶noun (pl. same or Thais)
- 1 a native or national of Thailand.
■ a member of the largest ethnic group in Thailand.
- 2 the official language of Thailand.
– origin Thai, lit. ‘free’.
'Thai' also found in these Oxford entries:

