Which prefix refers to the chest or thorax?

The prefix that refers to the chest or thorax is "thorac/o." This term is derived from the Greek word "thorax," which signifies the ribcage area that houses vital organs such as the heart and lungs. It is commonly used in medical terminology to denote conditions, procedures, and anatomical structures related to the thoracic region. For example, terms like "thoracotomy," which refers to an incision into the chest wall, and "thoracentesis," a procedure to remove fluid from the pleural space, clearly illustrate the application of this prefix in medical contexts.

The other prefixes do not relate to the chest; "super/o" means above or excessive, "umbillic/o" pertains to the navel or umbilicus, and "ventr/o" refers to the belly or front side of the body. These distinctions clarify why "thorac/o" is the most appropriate choice for indicating the thoracic region.