phonocardiogram
noun
pho·no·car·dio·gram ˌfō-nə-ˈkär-dē-ə-ˌgram 
: a graphic representation of heart sounds made by means of a microphone, amplifier, and recording equipment
Word History
Etymology
borrowed from German Phonokardiogramm, from phono- phono- + Kardiogramm cardiogram
First Known Use
1911, in the meaning defined above
Medical Definition
phonocardiogram
noun
pho·no·car·dio·gram ˌfō-nə-ˈkärd-ē-ə-ˌgram
: a graphic record of heart sounds made by means of a phonocardiograph