diatomaceous earth: meaning, definition, pronunciation and examples

Food-grade diatomaceous earth is generally considered safe when used as directed. However, the fine dust can be a respiratory irritant if inhaled, and it should not be ingested in large quantities. Always use appropriate safety gear like a mask when applying it in dusty conditions.

It works mechanically, not chemically. The microscopic, sharp-edged fossil particles absorb the waxy, protective outer layer of an insect's exoskeleton, causing the insect to dehydrate and die.

Food-grade DE is purified and safe for use around animals and in some food applications. Filter-grade (or pool-grade) DE is often heat-treated (calcined), altering its structure for better filtration but making it unsafe for consumption or use as a pesticide.

Yes, many organic certification bodies approve the use of natural, uncalcined diatomaceous earth as a pest control substance and soil amendment, as it is considered a physical, rather than synthetic chemical, intervention.

A fine, crumbly, pale sedimentary powder composed of the fossilised silica shells of microscopic aquatic algae called diatoms.

Diatomaceous earth is usually technical/scientific in register.

Diatomaceous earth: in British English it is pronounced /ˌdaɪ.ə.təˌmeɪ.ʃəs ˈɜːθ/, and in American English it is pronounced /ˌdaɪ.ə.t̬əˌmeɪ.ʃəs ˈɝːθ/. Tap the audio buttons above to hear it.