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- Dictionaryserac/ˈsɛrak/
noun
- 1. a pinnacle or ridge of ice on the surface of a glacier.
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noun
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A serac is a block or column of glacial ice, often formed by intersecting crevasses on a glacier. Commonly house-sized or larger, they are dangerous to mountaineers, since they may topple with little warning. Even when stabilized by persistent cold weather, they can be an impediment to glacier travel. Wikipedia