serac
noun
se·rac sə-ˈrak 
sā-
: a pinnacle, sharp ridge, or block of ice among the crevasses of a glacier
Example Sentences
Recent Examples on the Web The detached section is know as a serac, or pinnacle of ice. 
Frances D'emilio, Anchorage Daily News, 3 July 2022 On September 21, Madison’s workers noticed a serac hanging nearly 3,000 feet over the Icefall. Frederick Reimers, Outside Online, 11 Oct. 2020 No one made it to the summit of Everest in the fall of 2019, and the serac fell sometime between October 2019 and November 2020. Frederick Reimers, Outside Online, 30 Dec. 2021 Leclerc was planning on visiting Torre Egger soon, on a route that would take him directly below the active serac. Los Angeles Times, 14 Sep. 2021 It’s this dynamic of fast and slow moving sections that creates ice seracs that are over 30 feet high and crevasses, some of which are over 150 feet deep. Alan Arnette, Outside Online, 26 Apr. 2018 After the serac collapsed, the damaged route was closed for two hours while a specialized team of Sherpas, known as the Icefall Doctors, climbed to the location with new ropes and ladders to make repairs. Alan Arnette, Outside Online, 26 Apr. 2018 See More
Frances D'emilio, Anchorage Daily News, 3 July 2022 On September 21, Madison’s workers noticed a serac hanging nearly 3,000 feet over the Icefall. Frederick Reimers, Outside Online, 11 Oct. 2020 No one made it to the summit of Everest in the fall of 2019, and the serac fell sometime between October 2019 and November 2020. Frederick Reimers, Outside Online, 30 Dec. 2021 Leclerc was planning on visiting Torre Egger soon, on a route that would take him directly below the active serac. Los Angeles Times, 14 Sep. 2021 It’s this dynamic of fast and slow moving sections that creates ice seracs that are over 30 feet high and crevasses, some of which are over 150 feet deep. Alan Arnette, Outside Online, 26 Apr. 2018 After the serac collapsed, the damaged route was closed for two hours while a specialized team of Sherpas, known as the Icefall Doctors, climbed to the location with new ropes and ladders to make repairs. Alan Arnette, Outside Online, 26 Apr. 2018 See More Word History
Etymology
French sérac, literally, a kind of white cheese, from Medieval Latin seracium whey, from Latin serum whey — more at serum
First Known Use
1860, in the meaning defined above