sérac

UK: /ˈsɛræk/ US: (si rak′; Fr. sā rak′)

WordReference Random House Unabridged Dictionary of American English © 2025

sé•rac  (si rak′; Fr. sā rak′), n., pl. -racs 

(-raks′; Fr. -rak′). 
1. Geology a large irregularity of glacial ice, as a pinnacle found in glacial crevasses and formed by melting or movement of the ice.

Also, se•rac′. 

• Latin serum whey
• French sérac kind of white cheese (compare Medieval Latin serācium), ultimately
• 1855–60

Collins Concise English Dictionary © HarperCollins Publishers::

sérac / ˈsɛræk/ noun

1. a pinnacle of ice among crevasses on a glacier, usually on a steep slope

Etymology: 19th Century: from Swiss French: a variety of white cheese (hence the ice that it resembles) from Medieval Latin serācium, from Latin serum whey