- a rose-colored dye, CHOBr, prepared by brominating fluorescein and used to color inks, fabrics, etc. and to stain tissues
- its sodium or potassium salt, used as a reddish dye and as a stain in microscopy
- any of various similar red dyes
Origin of eosin; from Classical Greek ??s, dawn (see eo-) + -in
- A yellowish-red crystalline powder, C20H8 Br4O5, used in textile dyeing and ink manufacturing, as a biological stain, and in coloring gasoline.
- Any of a group of red fluorescent bromine derivatives of fluorescein, or their sodium or potassium salts, used in ink manufacturing, textile dyeing, and in biology to stain cells.
Origin of eosinGreek &emacron;&omacron;s, dawn (from its color); see aus- in Indo-European roots + –in.
(countable and uncountable, plural eosins)