The process or result of red blood cells clumping together, often used to identify viruses or test blood compatibility.
From haema + agglutination (noun form of agglutinate), derived from Latin gluten (glue). This term became standard in medical testing in the 20th century.
Haemagglutination is the basis for rapid flu tests and blood-typing! When you get a flu test that shows results in minutes, you're actually watching for this clumping reaction, which tells doctors exactly what virus you have.
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