diatomaceous earth

di`a*to*ma"ceous earth`

(Geol.), a deposit of fine, usually white, siliceous material, composed mainly of the shells of the microscopic plants called diatoms; also called infusorial earth, kieselguhr, and diatomite. It is used in polishing powder, and in the manufacture of dynamite.
[1913 Webster +PJC]

 

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Sat 15th December 2018