timberline

[tim-ber-lahyn]
noun
1.
the altitude above sea level at which timber ceases to grow.
2.
the arctic or antarctic limit of tree growth.
Also called tree line.


Origin:
1865–70, Americanism; timber + line1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
timberline (ˈtɪmbəˌlaɪn)
 
n
See also tree line the altitudinal or latitudinal limit of normal tree growth

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
timberline   (tĭm'bər-līn')  Pronunciation Key 
A geographic boundary beyond which trees cannot grow. On the Earth as a whole, the timberline is the northernmost or southernmost latitude at which trees can survive; in a mountainous region, it is the highest elevation at which trees can survive. Also called tree line.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

timberline

upper limit of tree growth in mountainous regions or in high latitudes, as in the Arctic. Its location depends largely on temperature but also on soil, drainage, and other factors. The mountain timberline always would be higher near the Equator than near the poles if it were not for the abundant rainfall in equatorial mountainous regions, which lowers the air temperatures. The timberline in the central Rockies and Sierra Nevadas is around 3,500 metres (11,500 feet), whereas in the Peruvian and Ecuadorian Andes it is between 3,000 and 3,300 metres (10,000 and 11,000 feet). In much of the central and southern Rockies there is a double timberline: the usual high timberline below which there is a belt of normal tree growth; and then a low timberline below which no trees grow because of low precipitation and high temperatures.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Watch the weather, especially if you are climbing above the timberline.
Timberline is not a base area, so the ticket checkers do not need to check your
  ticket.
If threatening weather is in the area, don't climb, because there is no
  protection from lightning once you are above timberline.
Mountain goats prefer extremely steep and rugged areas above the timberline,
  and are excellent rock climbers.
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