Hypertext Webster Gateway: "infusorial"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Infusorial \In`fu*so"ri*al\, a. (Zo["o]l.)
Belonging to the Infusoria; composed of, or containing,
Infusoria; as, infusorial earth.
{Infusorial earth} (Geol.), 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.
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