American
1570s (n.); 1590s (adj.), from Modern Latin Americanus, from America, q.v.; originally in reference to what now are called Native Americans; the sense of "resident of North America of European (originally British) descent" is first recorded 1640s (adj.); 1765 (n.).
〔李〕n. 美国人 ←-an 1，-ian，-n [L] 表示“⋯地方的人；与⋯有关的人”