serac

1. (geography, glaciology) A sharp tower of ice formed by intersecting crevasses of a glacier.Examples: "Perhaps the finest part of it [the Lysjoch] is the grand sérac scenery of the Zwillinge Glacier. In August, 1876, a party of four, having missed the right track in crossing this pass when the snow was in very bad condition, were carried down in an avalanche of loose snow probably started by their own weight."; "Numerous blocks of ice, to which the name "serac" is given, covered the plain. These are large fragments of frozen snow, almost rectangular. They take their name from the resemblance they bear to a compact cheese called "serac," which is made from skimmed milk, and pressed into rectangular cans."; "As you mount the Aletschhorn from the sleeping place, towards the lowest col from which you first overlook the Lotsch Glacier there descends, from a higher plateau, and on your right hand, a large mass of sérac."