Meaning of diatomaceous earth

di'atoma'ceous earth'

Pronunciation: (dī-at'u-mīt"), [key]
  1. a fine siliceous earth composed chiefly of the cell walls of diatoms: used in filtration, as an abrasive, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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