diatomaceous earth

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di·a·to·ma·ceous earth

a powder made of desiccated diatom material; used as a filtering agent, adsorbent, and abrasive in many chemical operations.

di·a·to·ma·ceous earth

(dī'ă-tŏ-mā'shē-ŭs ĕrth)
A powder made of desiccated diatom material; used as a filtering agent, adsorbent, and abrasive in many chemical operations.

diatomaceous earth

Silica containing fossilized shells of microscopic algae with a siliceous or calcium-containing cell wall. It is used in insulating material and filters and as an absorbent. Synonym: diatomite