[si-rak; French sey-rak]
noun, plural séracs [si-raks; French sey-rak] .
a large irregularity of glacial ice, as a pinnacle found in glacial crevasses and formed by melting or movement of the ice.
Also, serac.

1855–60; < French sérac kind of white cheese (compare Medieval Latin serācium), ultimately < Latin serum whey Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sérac (ˈsɛræk)
a pinnacle of ice among crevasses on a glacier, usually on a steep slope
[C19: from Swiss French: a variety of white cheese (hence the ice that it resembles) from Medieval Latin serācium, from Latin serum whey]

Collins English Dictionary - Complete & Unabridged 10th Edition
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