bergschrund (berg'-schrund). A deep and often wide gap or crevasse in ice or firn at or near the head of an alpine glacier or snowfield. The bergschrund separates moving ice and snow from the relatively immobile ice and snow ( ice apron ) adhering to the confining headwall of a cirque. It may be covered by or filled with snow during the winter but visible and reopened in the summer. Etymol: German "Bergschrund", "mountain crack". Cf: randkluft. Syn: schrund.