[ek-oh-kahr-dee-uh-graf, -grahf] 
| an instrument employing reflected ultrasonic waves to examine the structures and functioning of the heart. |
[ek-oh-kahr-dee-uh-graf-ik] , ech⋅o⋅car⋅di⋅o⋅graph⋅i⋅cal, adjective [ek-oh-kahr-dee-og-ruh-fee] , noun 
oʊˈkɑr