a pond or tank having a false bottom covered with sand and serving to filter river or pond waters.
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Words And Phrases Your Parents Used That You Can’t Use NowParenting has changed over the years and so has the language. While some phrases were popular years ago, today they are obsolete ... and for good reason. Here are ten old expressions that your parents might have used but you wouldn't dare use today.
Origin of filter bed
First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for filter bed
a layer of sand or gravel in a tank or reservoir through which a liquid is passed so as to purify itCompare bacteria bed
any layer of material through which a liquid is passed so as to filter it
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012