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A "dam" is a block or impediment, which holds material in place and/or prevents its motion. The typical dam is a large structure, usually concrete, that blocks a waterway. It may be designed to retain water (a reservoir) or to create hydroelectric power. Other dams can restrict the flow of air, or other fluids (the dental dam used in dentistry).

The word dam (related to dame) is also applied to a female parent in some animals.

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13y ago

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