cardioscope

noun
car·​dio·​scope | \ ˈkärd-ē-ə-ˌskōp How to pronounce cardioscope (audio) \

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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one from the Upper Peninsula of Michigan

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