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diaphragm
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diatomaceous earth
di·a·to·ma·ceous earth


noun 
Definition:
 
1. geology 
Same as  diatomite
2. powdered rock used as nontoxic insecticide: a form of unrefined diatomite. Use: insecticide.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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