Portuguese
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from Portuguese português, from medieval Latin portugalensis .
wiktionary
From Portuguese português.
etymonline
Portuguese (n.)
1610s, the language of Portugal, also (1620s) a resident of Portugal; 1660s as an adjective, "of or pertaining to Portugal," from Portuguese Portuguez (see Portugal + -ese). The ending was vulgarly mistaken for a plural in English, and false singular Portugee (by 1821) was formed. Compare Chinee from Chinese; also portegue, portague (1530s), name of a gold coin from Portugal, apparently also a false singular. For Portuguese man-of-war, see man-of-war.