英语词源字典 - 在线词源网站

coulee (n.)[coulee 词源字典]: "deep ravine, seasonally flooded," 1804, a North American word, originally in areas explored by French trappers, from French coulée "flow" (17c.), from fem. past participle of couler "to flow," from Latin colare "to filter, strain" (see colander).[coulee etymology, coulee origin, 英语词源]
seasonal (adj.): "pertaining to the seasons; relating to a season," 1829, from season (n.) + -al (1). Of workers or employment, from 1904. Related: Seasonally.