eosine

Noun

eosin (countable and uncountable, plural eosins)

1. A red, acidic dye commonly used in histological stains.
   • Thus the fluorescence of the familiar dye eosin can be excited quite well by ultra-violet or short-wave blue light, but is much better excited by visible green light with a wavelength close to that of the emitted radiation.1999, Dan J. Goldstein, Understanding the Light Microscope, page 91