Something that dilates or enlarges the heart, such as a medication that widens blood vessels or increases the heart's chamber size.
From cardio- (Greek kardia, 'heart') + dilator (from Latin dilatare, 'to spread out' or 'to widen'). Medical term from 19th-century pharmacology describing cardiac-dilating agents.
Nitroglycerin is a famous cardiodilator used for angina—it widens the blood vessels feeding your heart, allowing more oxygen through and relieving the crushing chest pain of insufficient blood flow.
Complete word intelligence in one call. Free tier — 50 lookups/day.