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timberline

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timberline/ˈtɪmbɚˌlaɪn/noun
pluraltimberlines
timberline
/ˈtɪmbɚˌlaɪn/
noun
pluraltimberlines
Learner's definition of TIMBERLINE  
[singular]
: an imaginary line on a mountain or high area of land that marks the level above which trees do not grow
— called also tree line
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