oar（n.）
"划船的长木杆," 中古英语 or, 源自古英语 ar, 源自原始日耳曼语 *airo (同源于古挪威语 ar, 丹麦语 aare, 瑞典语 åra), 词源不详。与拉丁语 remus “桨”、希腊语 eretēs “划手”、eretmos “桨”、英语 row (v.) 和 rudder 无关。作为“动物的桨状附属物”，始见于1580年代。
A long oar, used occasionally to assist a vessel in a calm, is a sweep, and is operated by two or more men. Small oars are sculls; one rower wielding a pair, sitting midlength of the thwart. ["Knight's American Mechanical Dictionary," 1884]
一根长桨，偶尔用于在平静的水面上帮助船只，称为 sweep，由两个或更多人操作。小桨是 sculls； 一名划手握着一对桨，坐在座位中央。["Knight's American Mechanical Dictionary," 1884]