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The Collaborative International Dictionary
Silicification

Silicification \Si*lic`i*fi*ca"tion\, n. [See Silicify.] (Chem.) Thae act or process of combining or impregnating with silicon or silica; the state of being so combined or impregnated; as, the silicification of wood.

Wiktionary
silicification

n. (context geology English) impregnation with silica; petrification