coulee (n.)youdaoicibaDictYouDict[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]