Pronunciation (UK) IPA (key): /fɔːˈməʊ.sə/ (US) IPA (key): /fɔrˈmoʊ.sə/ or /fɔrˈmoʊ.zə/ Audio (UK)(file) Proper noun Proper noun Formosa Formosa is the former name of Taiwan.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads