American Heritage® Dictionary of the English Language, Fourth Edition
- n. A layer of sand or gravel on the bottom of a reservoir or tank, used to filter water or sewage.
Century Dictionary and Cyclopedia
- n. A pond or tank having a false bottom covered with sand, and serving to filter river- or pond-waters.
GNU Webster's 1913
- n. a pond, the bottom of which is a filter composed of sand gravel.
- n. filter consisting of a layer of sand or gravel for filtering water
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