from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See timberline.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A division in altitude above which trees tend not to grow on mountains.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. line marking the upper limit of tree growth in mountains or northern latitudes
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