Tree Island noun1 •An island of the Paracel Islands in the South China Sea administered under Sansha, Hainan, China (claimed by Taiwan (ROC) and Vietnam).On the same day, a U.S. military plane intruded into China's airspace over Chaoshu Island, Yunghsing Island, and Tung Island of the Hsisha island group, Kwangtung, from 1128 to 1218. — 1964
