from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A light-colored porous rock composed of the shells of diatoms.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A light soil consisting of siliceous diatom remains and often used as a filtering material or microabrasive.
from the GNU version of the Collaborative International Dictionary of English
- a deposit of fine, usually white, siliceous material, composed mainly of the shells of the microscopic plants called diatoms; also called infusorial earth, kieselguhr, and diatomite. It is used in polishing powder, and in the manufacture of dynamite.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a light soil consisting of siliceous diatom remains and often used as a filtering material
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