serac

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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.]

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]