| kieselguhr | <chemical> Kieselguhr. A soft, bulky, solid material (88% silica) composed of skeletons of small prehistoric aquatic plants related to algae (diatoms). It can absorb 1.5-4 times its weight in water. Chemical name: Kieselguhr (12 Dec 1998) |
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| kieselguhr | a light soil consisting of siliceous diatom remains and often used as a filtering material |
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