Oxford Dictionary English treeline nounnoun BrE BrE//ˈtriːlaɪn// ; NAmE NAmE//ˈtriːlaɪn// [singular] Mountains and valleys Add to my wordlistjump to other resultsa level of land, for example on a mountain, above which trees will not grow There’s still some snow above the treeline. See related entries: Mountains and valleysSee treeline in the Oxford Advanced American DictionaryCheck pronunciation: treeline oxfordlearnersdictionaries.com
