Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The elevation in a mountainous region above which trees do not grow.
  • n. The northern or southern latitude beyond which trees do not grow.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the height or limit beyond which trees do not grow in mountainous or arctic regions.

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

Etymologies

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