Wiktionary
echocardiograph
n. (context medicine English) A device that uses ultrasound to produce images of the heart
WordNet
echocardiograph
n. a sonograph that creates an image of the heart and its abnormalities
Usage examples of "echocardiograph".
Later, back on earth, Orlov was told the on-board echocardiograph had showed that his cardiovascular activity slowed and remained down after his rest.