echocardiogramnoun [ C ]
/ˌek.əʊˈkɑː.di.ə.ɡræm//ˌek.oʊˈkɑːr.di.ə.ɡræm/specializeda test using ultrasound (= sound waves used to produce an image of the inside of someone's body) to examine the structure of the heart and how well it is working:
An echocardiogram showed her heart was pumping out only about 10% of the blood it collects, compared with about 60% in a healthy person.