from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A layer of sand or gravel on the bottom of a reservoir or tank, used to filter water or sewage.

from The Century Dictionary.

  • noun A pond or tank having a false bottom covered with sand, and serving to filter river- or pond-waters.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun filter consisting of a layer of sand or gravel for filtering water


Sorry, no etymologies found.


    Sorry, no example sentences found.


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