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Infusorial

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Infusorial

(Science: zoology) Belonging to the Infusoria; composed of, or containing, Infusoria; as, infusorial earth.

(Science: geology) infusorial earth, a deposit of fine, usually white, siliceous material, composed mainly of the shells of the microscopic plants called diatoms. It is used in polishing powder, and in the manufacture of dynamite.