"Coron/o" is a medical combining form that refers to the heart. It is derived from the Latin word "corona," which means "crown." 

Usage: 

• Coronary artery: The blood vessels that encircle and supply blood to the heart. 

Coronary heart disease (CHD): A condition in which the coronary arteries become narrowed or blocked. Coronectomy: Surgical removal of a part of the heart muscle. 

Other related terms:

• Cardio: Combining form for heart
• Myo: Combining form for muscle
• Ventricul: Combining form for ventricle (a chamber of the heart) 

Note: "Coron/o" is not to be confused with "onco/o," which is a combining form for tumor.