石化作用 shíhuàzuòyòng petrifaction Origin Definitions Defs Strokes Stroke Words Sentences Sents 石化 shíhuà fossilization The geological process by which organic matter turns into stone; petrification作用 zuòyòng noun function the natural purpose or activity of something, such as a biological or chemical process; often used as a suffix to mean "-ation" or "-ing" as in 消化 xiāohuà plus this word for "digestion"