ˈēəsə̇n noun
or eo·sine “, -ˌsēn
( -s )
Etymology: International Scientific Vocabulary eos- (from Greek ēōs dawn) + -in, -ine; originally formed as German eosin; from the color it gives to silk — more at east
1.
a. : a red crystalline fluorescent dye C 20 H 8 Br 4 O 5 made by bromination of fluorescein and used chiefly in cosmetics and as a toner; tetrabromo-fluorescein — called also bromo acid
b. often capitalized : the red to brown crystalline sodium or potassium salt of this dye used chiefly in making pink or red organic pigments, in microscopy as a biological stain, and in pharmaceutical preparations — called also Eosine G, Eosine Y, Eosine Yellowish ; see dye table I (under Acid Red 87 )
2. often capitalized : any of several dyes related chemically to eosin
Eosine B or Eosine Bluish
Eosine H8G
— see dye table I (under Acid Orange II )