timber-line

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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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
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