noun
: a stream in transition from the stage of youth to that of maturity in the erosion cycle characterized by a smoothly graded course without waterfalls or rapids and with only a very narrow valley flat
noun
: a stream in transition from the stage of youth to that of maturity in the erosion cycle characterized by a smoothly graded course without waterfalls or rapids and with only a very narrow valley flat
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012