diatomaceous earth

Diatomaceous earth (IPA: , also known as DE, TSS, diatomite, diahydro, kieselguhr, kieselgur and Celite) is a naturally occurring, soft, chalk-like sedimentary rock that is easily crumbled into a fine white to off-white powder. This powder has an abrasive feel, similar to pumice powder, and is very light, due to its high porosity. The typical chemical composition of diatomaceous earth is 86% silica, 5% sodium, 3% magnesium and 2% iron.
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Noun
1. a light soil consisting of siliceous diatom remains and often used as a filtering material
(synonym) diatomite, kieselguhr
(hypernym) earth, ground

A chalk-like material (fossilized diatoms) used to filter out solid waste in wastewater treatment plants; also used as an active ingredient in some powdered pesticides.

finely ground fossilized shells of minuscule hard-shelled algae called diatoms; also known as diatomite or kieselguhr, naturally occurring DE is roughly 86% silicon, 5% sodium, 3% magnesium, and 2% iron.

diatomaceous earth /,daiətə'meiʃəs'ə:θ/
danh từ (địa lý,địa chất) điatomit
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