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n. pl. Thai or Thais
a. A native or inhabitant of Thailand.
b. A member of a Tai-speaking people who constitute the predominant ethnic group of Thailand.
2. The language of the Tai family that is the official language of Thailand.
Of or relating to Thailand or its peoples, languages, or cultures.
(Biography) 4th-century bc Athenian courtesan; mistress of Alexander the Great