A microscope slide with a precise grid pattern used to count blood cells and determine their concentration in a blood sample.
From Greek haima 'blood,' kytos 'cell,' and metron 'measure.' This compound word reflects modern medical terminology where precise measurement of blood cell populations became clinically essential.
The hemacytometer grid is so finely calibrated that a doctor can count individual cells under a microscope—it transformed blood testing from guesswork to quantitative science in the late 1800s!
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