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Definition of Ice dam
1. Noun. an obstruction to the flow of a river caused by the flow of a glacier ¹
2. Noun. (roofing) a mass of ice formed at the transition from a warm to a cold roof surface, frequently formed by refreezing meltwater at the overhang of a steep roof, causing ice and water to back up under roofing materials. ¹
¹ Source: wiktionary.com