from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The lower altitudinal boundary of a snow-covered area, especially of one that is perennially covered, such as the snowcap of a mountain.
  • noun The fluctuating latitudinal boundaries around the polar regions marking the extent of snow cover.

from The Century Dictionary.

  • noun The limit of continual snow, or the line above which a mountain is continually covered with snow.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The altitude, in a mountainous region, above which the ground is covered with snow, at any particular time.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the line on a mountain above which there is perpetual snow and ice


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