An instrument that measures the speed or rate of blood flow through vessels.
From Greek 'hema' (blood) + 'tachy' (fast) + 'metron' (measure), literally 'blood-speed-measurer,' used in early cardiology to assess circulation.
Hematachometers were the ancestors of modern Doppler ultrasound—both measure blood speed, but today we use sound waves instead of mechanical sensors, letting doctors see flow without touching the skin.
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