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/ˌpɛtɹɪˈfæktɪv/ · adjective
Having the quality of converting organic matter into stone; petrifying..
petrifactive changes
Hereof in ſubterraneous cavities, and under the earth there are many [objects resembling unicorns' horns] to be found in ſeverall parts of Germany; which are but the Lapideſcencies and petrifactive mutations of hard bodies; [...]
Use petrifactive when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Petrifactive means Having the quality of converting organic matter into stone; petrifying..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
petrifactive changes
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