An instrument or device used to count the number of red blood cells in a sample of blood.
From Greek erythro- (red) + cyto- (cell) + -meter (instrument for measuring). This compound term was developed in the 19th century as microscopy technology advanced and scientists needed specialized tools to count blood cells.
Before automated blood counters existed, doctors used erythrocytometers—special slide chambers with tiny grids—to manually count each red blood cell under a microscope. Modern flow cytometers do the same job in seconds, processing thousands of cells per second!
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