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also sé·rac  (sə-răk′, sā-)
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.


(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