the GNU version of the Collaborative International Dictionary of English
adj. Belonging to the Infusoria; composed of, or containing, Infusoria.
The Century Dictionary and Cyclopedia
In zoology:
Developed in infusions, as animalcules.
Containing or consisting of infusorians: as, infusorial earth.
Having the characters of the Infusoria; pertaining in any way to the Infusoria.
Word Usage
"(_see_ below) attendant upon the use of a solid purifying material, is absorbed in that highly porous and inert description of silica known as infusorial earth or "kieselguhr.""