kieselguhr

from WordNet (r) 3.0 (2006)

kieselguhr
    n 1: a light soil consisting of siliceous diatom remains and
         often used as a filtering material [syn: {diatomaceous
         earth}, {diatomite}, {kieselguhr}]

from The Collaborative International Dictionary of English v.0.48

Infusorial \In`fu*so"ri*al\, a. (Zool.)
   Belonging to the Infusoria; composed of, or containing,
   Infusoria; as, infusorial earth.
   [1913 Webster]

   {Infusorial earth} (Geol.), 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.
      [1913 Webster +PJC]

from The Collaborative International Dictionary of English v.0.48

Kieselguhr \Kie"sel*guhr`\, n. [G., fr. kiesel flint + guhr an
   earthy deposit or sediment in water.]
   Siliceous earth; diatomaceous earth; specifically, porous
   infusorial earth, used as an absorbent of nitroglycerin in
   the manufacture of dynamite.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

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]