: the action, process, or effect of corroding <arterial corrosion that characterizes arteriosclerosis—Journal of the American Medical Association>
: a study specimen of an organ or other structure prepared by injection of hollow parts (as blood vessels) with a plastic and subsequent removal of the surrounding tissue by corrosion
Wearing away due to chemical reactions, mainly oxidation (seeoxidation-reduction, oxide). It occurs whenever a gas or liquid chemically attacks an exposed surface, often a metal, and is accelerated by warm temperatures and by acids and salts. Normally, corrosion products (e.g., rust, patina) stay on the surface and protect it. Removing these deposits reexposes the surface, and corrosion continues. Some materials resist corrosion naturally; others can be treated to protect them (e.g., by coating, painting, galvanizing, or anodizing).