From The Collaborative International Dictionary of English v.0.48 [gcide]:
Formosan \Formosan\ prop. adj.
of, pertaining to, or characteristic of, Formosa or the
natives of Formosa; as, The native Formosan population now
forms a minority on their own island..
Syn: Taiwanese, Chinese.
[WordNet 1.5]
From WordNet (r) 3.0 (2006) [wn]:
Formosan
adj 1: of or relating to or characteristic of the island
republic on Taiwan or its residents or their language;
"the Taiwanese capital is Taipeh" [syn: Taiwanese,
Chinese, Formosan]
n 1: the Austronesian languages spoken on Formosa