01 a. Belonging to the Infusoria; composed of, or containing, Infusoria; as, infusorial earth.
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1.
Belonging to the Infusoria; composed of, or containing, Infusoria; as, infusorial earth.(Zool.)
Phrases & compounds
Infusorial earth —
a deposit of fine, usually white, siliceous material, composed mainly of the shells of the microscopic plants called diatoms; also called diatomaceous earth, kieselguhr, and diatomite. It is used in polishing powder, and in the manufacture of dynamite.