1. A red or pink synthetic dye derived from fluorescein, used in textiles, cosmetics, and as a biological stain.
Usage: Also spelled eosin.; Chemistry and biology term.

Examples

• The laboratory technician used eosine to stain the tissue samples for microscopic examination.
• Eosine is commonly added to cosmetics to produce red and pink shades.
• The textile manufacturer selected eosine for its bright, stable color properties.
• Under the microscope, the eosine-stained cells appeared in shades of pink and red.
• Eosine has been used in biological research for over a century to highlight cellular structures.