diatomaceous earth

Save This Word!

a fine siliceous earth composed chiefly of the cell walls of diatoms: used in filtration, as an abrasive, etc.
Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
Question 1 of 7
“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.
Also called di·at·o·mite [dahy-at-uh-mahyt], /daɪˈæt əˌmaɪt/, kieselguhr.

Origin of diatomaceous earth

First recorded in 1880–85

Words nearby diatomaceous earth

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use diatomaceous earth in a sentence

British Dictionary definitions for diatomaceous earth

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

Medical definitions for diatomaceous earth

diatomaceous earth
[ dī′ə-tə-māshəs, 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.