Fossilising is a term that describes the process in which organic matter turns into a fossil. Synonyms for this term include petrifying, fossilization, calcifying, consolidating, ossifying, and mineralizing. Each of these synonyms describes different aspects of the fossilisation process. Petrifying refers to the hardening of organic matter into stone. Fossilization and calcifying describe the formation of fossils from organic matter. Consolidating and ossifying refer to the combination of several layers into one solid surface. Mineralizing, on the other hand, refers to the replacement of organic matter by minerals. Overall, these synonyms help to describe the various ways in which organic matter transforms into fossils over time.