kieselguhr
/ˈkiːzəlˌɡʊr/
noun
- A soft, light-colored sedimentary rock made from the fossilized remains of tiny aquatic organisms called diatoms; used in filters, abrasives, and as an absorbent.
- Kieselguhr is used in water filtration systems to remove impurities.
- Some gardeners add kieselguhr to soil to improve drainage.
- The lab used kieselguhr as a filtering agent for the chemical solution.
Synonyms