Timberline

//ˈtɪmbɚˌlaɪn// noun

Definitions

Noun
  1. 1
    The height or limit beyond which trees do not grow in mountainous or Arctic regions.

    "Most flocks in the Sierra and the Rocky Mountains live above the timber-line and at an altitude of twelve thousand feet."

  2. 2
    line marking the upper limit of tree growth in mountains or northern latitudes wordnet

Etymology

From timber + line.

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