thionine
/ˈθaɪəniːn/
noun
- A dark blue or purple dye used in biology to stain cells and tissues for microscopic examination.
- Thionine is commonly used in histology to highlight the nucleus of a cell.
- In the lab, we added a drop of thionine to the slide to stain the plant tissue.
- The biologist used thionine to make the nerve cells visible under the microscope.