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se·rac

also sé·rac  (sə-răk′, sā-)
n.
A large pointed mass of ice in a glacier isolated by intersecting crevasses.

[French sérac, strong cheese made from whey, serac (from the resemblance of glaciers with many seracs to unpressed cheese curds ), alteration of French dialectal (Savoy and Switzerland) seraz, sérē, from Vulgar Latin *serāceum, whey cheese, from Latin serum, whey.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

sérac

(ˈsɛræk)
n
(Physical Geography) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Two members of the expedition recently abandoned their summit push on the mountain after assessing the risks of avalanches and seracs, but Daniel Nardi and Tom Ballad stayed on, waiting for a window of clear weather to reach the summit.
"It seems that seracs (glacial ice) and snow fell from high on the mountain and the strong gusts of winds from that hit the campsite, throwing the climbers off," said rescuer Suraj Paudyal who reached the site Sunday.
The Optys bottle is produced in a single stage by vertical thermoforming of an extruded PP sheet on Seracs machine at medium output (up to 10 000 bph).
He added: "At many points you'd have swinging seracs [blocks of ice] the size of a three-storey house above your head, with bits breaking off.
Reality has set in." The ice avalanche struck a perilous passage called the Khumbu Icefall, which is riddled with crevasses and piled with seracs - massive ice boulders or columns that can break free without warning.
At Camp 4, climbers have to traverse beneath an overhang of enormous ice, or seracs, that could collapse at any time.
Some are like the rolling hills of Vermont, others have waves of crevasses like a frozen ocean, or seracs that stand like chess pieces ready to topple, and others are so blue that with the blink of an eye the mind expects the illusion to be unmasked.
From high above, massive seracs along the western shoulder are also looming--sections that calve off have been known to send a deadly blast of avalanche debris across the entire route.
Despite the fact she'd managed to shoulder him, whoever he was, and drag him in places, through ice fields, across crevasses, over seracs. Or that somehow she'd willed her way down a second time, with him in tow, almost as far as their fourth camp, so they found them huddled together the next morning, after the storm, with him still alive in her arms.
My uncle had traveled as well--though in his heart only--in the region that, after partition, has become northern Pakistan, up the broad then brittle-thin ridges of Nanga Parbat, and labored--first the tips of his fingers then his thumbs and finally his wrists on the maps--across the cols of the Hindu Raj to Tirich Mir, traversing ice fields at the foot of its southern exposure, with their vast seracs and hidden crevasses, into the southwestern tail of the Hindu Kush.