Thai

[tahy] /taɪ/
noun
1.
Also called Thailander
[tahy-lan-der, -luh n-] /ˈtaɪˌlæn dər, -lən-/ (Show IPA). a native or descendant of a native of Thailand.
2.
the language of Thailand, a member of the Tai group of languages.
adjective
3.
of or pertaining to Thailand, its people, or their language; Siamese.
Also, Tai.
British Dictionary definitions for Thai

Thai

/taɪ/
adjective
1.
of, relating to, or characteristic of Thailand, its people, or their language
noun
2.
(pl) Thais, Thai. a native or inhabitant of Thailand
3.
the language of Thailand, sometimes classified as belonging to the Sino-Tibetan family
Also called Siamese
Word Origin and History for Thai

1808, native name, from Tai, literally "free." Thai stick "Asian marijuana cigarette" is attested by 1976.