thionin

/ˈθaɪənɪn/
noun
  1. A dark blue or purple dye used in biology to stain cells and tissues for microscopic examination.
    • The biologist used thionin to make the cell nuclei visible under the microscope.
    • After applying thionin, the nerve cells appeared a deep violet color.
    • Thionin is a common stain for studying brain tissue in neuroscience labs.
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