echocardiographyEnglishOxford New American Dictionaryechocardiography /ˌekōˌkärdēˈäɡrəfē, ˌɛkoʊˌkɑrdiˈɑɡrəfi / ▸ noun the use of ultrasound waves to investigate the action of the heart. – DERIVATIVES echocardiograph /ˌekōˈkärdēəˌɡraf/ noun,echocardiographic /-ˌkärdēəˈɡrafik/ adjective