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diatomaceous earth

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noun
  1. 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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for diatomite

diatomite

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, etcSee also diatomaceous earth
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diatomaceous earth

noun
  1. an unconsolidated form of diatomiteAlso called: kieselguhr
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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

diatomite in Medicine

diatomaceous earth

(dī′ə-tə-māshəs, dī-ăt′ə-)
n.
  1. A powder made of the desiccated shells of diatoms, used as a filtering agent, adsorbent, and abrasive in many chemical operations.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

diatomite in Science

diatomite

[dī-ătə-mīt′]
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.