kieselguhr, 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]
kieselguhr, n. diatomaceous earth forming deposits in lakes and ponds and used as a filter, filler, insulator, etc., in various manufacturing processes.