car·dio·scope | \ ˈkärd-ē-ə-ˌskōp 
\
\Medical Definition of cardioscope
1 : an instrument that permits direct visual inspection of the interior of the heart
2 : an instrument that permits continuous electrocardiographic observation of the heart's action during an operation
3 : an instrument equipped with a screen on which tracings of the heart's action and sounds can be shown
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