Formosan 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..
... Entering the Formosan Channel we proceed to the mouth of the Min, a fine river which leads up to Foochow (Fuchau), some thirty miles inland. We do not stop to explore the Island of Formosa because, having been ceded to Japan, it no longer forms a part of the Chinese ... — The Awakening of China • W.A.P. Martin