矽藻石; 矽藻土
Kieselguhr \Kie"sel*guhr`\, n. [G., fr. kiesel flint + guhr an earthy deposit or sediment in water.] Siliceous earth; specifically, porous infusorial earth, used as an absorbent of nitroglycerin in the manufacture of dynamite.
kieselguhr n : a light soil consisting of siliceous diatom remains and often used as a filtering material [syn: {diatomaceous earth}, {diatomite}]