serac

noun2

1. •
   A sharp tower of ice formed by intersecting crevasses of a glacier.

   • The Boltoro Glacier […] The surface of the glacier is rough and uneven, broken by crevasses and covered by seracs and rock debris. — 2017
2. •
   Often sérac: a hard, cone-shaped, pale green, strongly flavoured cheese from Switzerland made from skimmed cow milk and blue fenugreek (Trigonella caerulea); Schabziger, Sapsago. It is usually eaten grated, mixed with butter, or in a fondue.

   • The smoke found its way out of the holes in the roof as it liked best; and nearly over the fire was a black smoky shelf, supporting several masses of that inferior white cheese, called Serac. — 1826