part of the union territory of Daman and Diu (Goa, Daman, and Diu in 1961–87) in W India: a former Portuguese colony, comprising a small island and seaport at the extremity of Kathiawar peninsula.
Di·u (dē'ōō) An island of western India in the Arabian Sea northwest of Mumbai (Bombay). A Portuguese possession after 1535, Diu was invaded by India in 1961 and annexed the following year. It is now part of the union territory of Daman and Diu.