cardioscope
noun
car·dio·scope
ˈkärd-ē-ə-ˌskōp
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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Merriam-Webster unabridged
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