Radiopacity is a term that refers to the ability of a material or substance to block or resist the passage of X-rays. This term is often used in medical settings, particularly in radiology, where doctors and technicians use advanced imaging techniques to visualize internal structures of the body. Some synonyms for the term radiopacity include radio-opacity, radiodensity, and radiographic density. These terms are all used to describe the degree to which an object or substance is able to absorb or reflect X-rays, and are important indicators in determining various medical conditions. Radiographers and healthcare professionals must be familiar with these terms to accurately interpret medical imagery.