变质作用 biànzhìzuòyòng metamorphism Definitions Defs Origin Strokes Stroke Words Sentences Sents 变质 變質 biànzhì metamorphism the structural or chemical change in a plant part or a rock formation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"