Supercritical is a term used in scientific and engineering fields to describe a state where a substance is at a temperature and pressure that exceeds its critical point. Synonyms for supercritical include ultracritical, hypercritical, extreme-temperature and pressure, and high-density and pressure. In chemistry, the term may also be referred to as superheated and supercooled. Supercritical fluids have unique properties due to their increased density and solubility, making them highly useful for a range of applications such as extraction, sterilization, and chemical reactions. Understanding the synonyms for supercritical can help to expand one's technical vocabulary and increase comprehension of scientific literature and professional discussions.