thionin
/ˈθaɪənɪn/
noun
- 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.