a fine siliceous earth composed chiefly of the cell walls of diatoms: used in filtration, as an abrasive, etc.
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Origin of diatomaceous earth
First recorded in 1880–85
Also called di·at·o·mite [dahy-at-uh-mahyt] /daɪˈæt əˌmaɪt/, kieselguhr.
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British Dictionary definitions for diatomaceous earth
an unconsolidated form of diatomiteAlso called: kieselguhr
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
Medicine definitions for diatomaceous earth
[ dī′ə-tə-mā′shəs, dī-ăt′ə- ]
A powder made of the desiccated shells of diatoms, used as a filtering agent, adsorbent, and abrasive in many chemical operations.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.