A counting chamber or device used to count blood cells under a microscope for diagnostic blood tests.
From Greek 'haima' (blood) + 'kytos' (cell) + 'metron' (measure). Developed in the late 1800s as an essential laboratory tool for clinical hematology.
The hemocytometer was invented before computers, using tiny grid lines to manually count cells—it's still used today because it's reliable, and seeing cells directly teaches you what healthy blood actually looks like!
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