‖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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.