A chemical compound related to blood components or a dye that binds to blood elements, used historically in staining samples for microscopic examination.
From Greek 'haima' (blood) + '-in' (a chemical suffix for compounds). This term developed in 19th-century histology as scientists created dyes specifically designed to color blood cells for study.
Hematolin-based stains were revolutionary because they let doctors see individual white blood cells for the first time, which helped identify infections and blood diseases under early microscopes.
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