An instrument or measurement that determines the size or dimensions of the heart; a device for measuring cardiac dimensions.
From Greek 'kardia' (heart) + '-meter' (an instrument that measures, from 'metron' measure). The '-meter' suffix creates nouns for measuring devices like 'thermometer,' 'barometer,' and 'speedometer.'
'-Meter' is one of the most productive suffixes in science and medicine—you can measure almost anything and call it a meter (kilometer, ohmmeter, spirometer), turning the suffix into a universal tool for quantifying the world.
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