Tai 
(tī)
(tī)n. pl. Tai or Tais
1. A subfamily of Tai-Kadai languages spoken in southeast Asia and southern China that includes Thai, Lao, and Shan.
2. A member of any of the Tai-speaking peoples of Thailand, Myanmar (Burma), Laos, China, and Vietnam.
adj.
Of or relating to Tai, its speakers, or their culture.