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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.
Also called diatomite
[dahy-at-uh-mahyt] /daɪˈæt əˌmaɪt/ (Show IPA),
kieselguhr.
Origin
1880-1885
1880-85
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for diatomite
  • The top of the section also has basalt flows and diatomite as well.
  • The rock in question is diatomite, made of countless silica skeletons of microscopic aquatic plants.
  • Deposits of diatomite are prominently exposed at the surface in the southwestern portion of the subbasin.
  • But the formation of a diatomite deposit in a freshwater lake requires that many processes take place in and adjacent to the lake.
British Dictionary definitions for diatomite

diatomite

/daɪˈætəˌmaɪt/
noun
1.
a soft very fine-grained whitish rock consisting of the siliceous remains of diatoms deposited in the ocean or in ponds or lakes. It is used as an absorbent, filtering medium, insulator, filler, etc See also diatomaceous earth

diatomaceous earth

noun
1.
an unconsolidated form of diatomite Also 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
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diatomite in Medicine

diatomaceous earth di·a·to·ma·ceous earth (dī'ə-tə-mā'shəs, dī-āt'ə-)
n.
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.
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diatomite in Science
diatomite
  (dī-āt'ə-mīt')   
A fine, light-colored, friable sedimentary rock consisting mainly of the silica-rich cell walls of diatoms. Diatomite forms both in lacustrine and marine environments. It is used in industry as a filler, filtering agent, absorbent, abrasive, and insulator.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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