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petrification (n.)

"action or process of hardening, conversion into stone," 1610s, from French petrification (16c.), Latinized noun of action from pétrifier (see petrify). Etymologically better than the more common petrifaction.

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Definitions of petrification from WordNet

petrification (n.)
the process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape;
Synonyms: petrifaction
From wordnet.princeton.edu