A written record or graphical representation of heart activity; essentially the same as an electrocardiogram or ECG.
From Greek 'kardia' (heart) + '-gram' (something written, from 'graphein' to write). This follows the pattern of 'diagram,' 'telegram,' and 'anagram' where '-gram' denotes a recorded message or pattern.
The '-gram' suffix is incredibly productive in modern medicine and technology—X-rays, ultrasounds, and EEGs all produce grams (records), turning invisible phenomena into visible lines on paper that doctors can read like ancient oracles read entrails.
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