Definition of timberline in English:

timberline

noun

North american
  • another term for treeline
    • ‘He and I go right, then circle back toward her slowly, arduously, along the timberline.’
    • ‘Flowers were slightly more tubular at the timberline, where ants are more abundant.’
    • ‘Benton guided the paint around the scrub pine which marked the beginning of the timberline, careful to stay on the thin trail now under two inches of fresh snow.’
    • ‘In winters with heavy snowfall, they will often move below the timberline.’
    • ‘Trees at the alpine timberline were expected to exhibit a hydraulic architecture protecting the leader shoot from winter embolism.’

Pronunciation:

timberline

/ˈtɪmbəlʌɪn/