ˈtī noun
( plural thai or thais )
Usage: capitalized
1. or thai·land·er ˈtīˌlandə(r) -s : a native or inhabitant of Thailand or one of his descendants
2. : the language of the Thai : the official language of Thailand — called also Siamese
3. : a group of languages including Thai, Lao, Shan, Khamti, and Ahom and considered by some to belong to the Sino-Tibetan language group