An instrument used to count or measure the number and composition of blood cells.
From Greek 'haima' (blood) + '-meter' (measuring instrument). This term was developed in the 19th century as microscopy advanced and scientists needed to count cells.
The hematimeter was an ancestor of the modern blood counter—early doctors would literally count blood cells by hand under a microscope, which is why we needed special tools to make it easier and more accurate!
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