a layer of sand or gravel used to expose sewage effluent, in its final stages, to air and the action of microorganismsCompare filter bed (def. 1)
Buzzwords Tasty Enough To EatRead more in this article about some frequently asked questions and fun facts related to our definitions.
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- bacterial canker,
- bacterial capsule,
- bacterial endocarditis,
- bacterial infection
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