Definition of hainan:
(n) :
A province off the coast of southern China, primarily made up of Hainan Island. Capital: Haikou.
(n) :
An island off the coast of southern China.
(n) :
A Tibetan autonomous prefecture of Qinghai, China. Official name: Hainan Tibetan Autonomous Prefecture.
(n) :
A district of Wuhai, Inner Mongolia autonomous region, China.