Noun: diatomaceous earth ,dI-u-tu'mey-shus urth
- A light soil consisting of siliceous diatom remains and often used as a filtering material
"Diatomaceous earth is commonly used in pool filters and as a natural insecticide";
- diatomite, kieselguhr
Derived forms: diatomaceous earths
Type of: earth, filter, ground
Encyclopedia: Diatomaceous earth