An instrument that records or measures the activity and movements of the heart; a device for creating a cardiagram.
From Greek 'kardia' (heart) + '-graph' (an instrument that writes or records, from 'graphein' to write). The '-graph' suffix creates nouns for machines that produce records or images.
The difference between '-graph' (the machine) and '-gram' (the recording) confused everyone initially—when the cardiograph was invented, people had to learn that a cardiograph MAKES a cardiogram, just like a camera TAKES a photograph.
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