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The Collaborative International Dictionary
Dam plate

Dam \Dam\, n. [Akin to OLG., D., & Dan. dam, G. & Sw. damm, Icel. dammr, and AS. fordemman to stop up, Goth. Fa['u]rdammjan.]

  1. A barrier to prevent the flow of a liquid; esp., a bank of earth, or wall of any kind, as of masonry or wood, built across a water course, to confine and keep back flowing water.

  2. (Metal.) A firebrick wall, or a stone, which forms the front of the hearth of a blast furnace.

    Dam plate (Blast Furnace), an iron plate in front of the dam, to strengthen it.

Wiktionary
dam plate

n. An iron plate in front of the dam of a blast furnace, to strengthen it.