Plural of cardiograph; instruments or recordings that measure and display the heart's electrical activity.
Plural form of 'cardiograph,' from Greek 'kardia' (heart) + 'graphos' (writer). The word emerged in medical technology vocabulary in the 1870s-1880s as cardiac monitoring became possible.
The first cardiographs were massive machines that filled entire rooms, but your phone's health app now contains more heart-measuring power than those Victorian laboratories had!
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