Main Entry: car·dio·scope

Pronunciation: \ˈkärd-ē-ə-ˌskōp\

Function: noun

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