Snow-line

snow line

noun
1.
the line, as on mountains, above which there is perpetual snow.
2.
the latitudinal line marking the limit of the fall of snow at sea level.

Origin:
1825–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
snow line
 
n
the altitudinal or latitudinal limit of permanent snow

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
snow line  
  1. The boundary marking the lowest altitude at which a given area, such as the top of a mountain, is always covered with snow.

  2. The boundary marking the furthest extent around the polar regions at which there is snow cover. The polar snow lines vary with the seasons.


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