headwaterglossary / HEADWATER headwater.1. (usu. pl.) The part of a river or stream that is closest to its source.2. HEADSTREAM. 词条贡献者 译员Shifang,毕业于国内一流的高级翻译学院,专注翻译各种与员工福利与高管薪酬有关的法律文件。