a laboratory instrument used to observe or measure agglutination reactions, typically in blood typing or immunology.
From Latin 'agglutinare' (to glue to) plus Greek '-scope' (instrument for viewing). A technical term from early 20th-century medical/immunological research.
Before modern automatic blood analyzers, scientists stared through these devices watching red blood cells clump together (agglutinate) when exposed to different antibodies—it was literally how we first figured out blood types.
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