A specialized laboratory instrument used to count the number of blood cells in a small sample of blood under a microscope.
From Greek 'haima' (blood) + 'kytos' (cell) + 'metron' (measure). Developed in the late 19th century, this tool was essential before automated blood analysis became available.
The hemocytometer is a marvel of precision engineering—it's basically a tiny grid etched into a glass slide where each square has a known volume, allowing technicians to count cells in a grid and multiply to get the total concentration in your blood.
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