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diatomaceous earth

noun

  1. a fine siliceous earth composed chiefly of the cell walls of diatoms: used in filtration, as an abrasive, etc.


diatomaceous earth

noun

  1. an unconsolidated form of diatomite Also calledkieselguhr
“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
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Word History and Origins

Origin of diatomaceous earth1

First recorded in 1880–85
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Example Sentences

We made up a song about diatomaceous earth while we were driving in to the post office today, just because we thought it sounded funny.

Mixed with diatomaceous earth, a fine powder of algae fossils often used by gardeners, the coarse gray stuff makes a decent substitute for the density and texture of Mars’ dirt.

It suggests diatomaceous earth and commercial rust remover, blended to the consistency of peanut butter.

This four-mile formation, composed of clay and diatomaceous earth, has been a conservation priority of the tribe, the Chesapeake Conservancy, the U.S.

Some people also recommend sprinkling a layer of diatomaceous earth on top of soil to kill them.

From Salon

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