A specialized counting chamber used to measure the number of blood cells in a sample under a microscope.
From Greek 'haima' (blood) + 'kytos' (cell) + 'metron' (measure). A technical instrument name built from standard scientific Greek root words.
Before electronic blood counters, nurses literally looked through haemacytometers and counted thousands of individual cells—a tedious job that made them the human equivalents of supercomputers!
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