strath (n.)youdaoicibaDictYouDict[strath 词源字典]
"wide river valley between hills," 1530s, from Scottish, from Old Irish srath "wide river valley," from Old Celtic *s(t)rato-, from PIE root *stere- "to spread, extend, stretch out" (see structure (n.)).[strath etymology, strath origin, 英语词源]