Arrosion is a term often used to describe the erosion or corrosion of a material due to prolonged exposure to the elements. There are several synonyms that can be used to describe this process, including corrosion, rusting, decay, degradation, wearing away, and weathering. These words all describe the gradual breakdown of a material over time, whether it's due to exposure to water, air, or other environmental factors. Each of these synonyms has slightly different connotations and can be used in different contexts, but all refer to the same basic process of degradation and decay that occurs when a material is exposed to the elements for an extended period of time.