Webster's Online Dictionary
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Definition: CARDIAGRAPH

Part of Speech Definition
Noun 1. An alternative spelling for "Cardiograph": An instrument which, when placed in contact with the chest, will register graphically the comparative duration and intensity of the heart's movements.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "Cardiagraph" was first used in popular English literature: sometime before 1914. (references)

Definition: CARDIAGRAPH

Part of SpeechDefinition
Noun1. An alternative spelling for "Cardiograph": An instrument which, when placed in contact with the chest, will register graphically the comparative duration and intensity of the heart's movements.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "CARDIAGRAPH" was first used in popular English literature: sometime before 1914. (references)