Definition of Hainan
island of southeastern China in the South China Sea separated from the mainland by Hainan Strait, which connects the Gulf of Tonkin with the South China Sea; a province with its capital at Haikou area 13,124 square miles (33,991 square kilometers), population 8,671,485
HAINAN Defined for English Language Learners
Definition of Hainan for English Language Learners
: island of China
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