ice dam

  1. Noun.  an obstruction to the flow of a river caused by the flow of a glacier.
  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.

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This entry was last updated on RefTopia from its source on 3/20/2012.