frostline

 [frawst-lahyn, frost-]  

frost·line

   [frawst-lahyn, frost-]
noun
1.
the maximum depth at which soil is frozen.
2.
the lower limit of permafrost.
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Origin:
1860–65, Americanism; frost + line1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Frostline is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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