An instrument used to count, measure, or analyze cells, especially in blood or tissue samples.
From Greek 'cyto-' (cell) + '-meter' (measuring device, from 'metron', measure). Modern cytometers like flow cytometers emerged in the late 20th century.
A flow cytometer is one of medicine's superpowers—it can measure millions of cells per second, sorting them by type with laser precision, revealing invisible infections and cancer markers.
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