eosin

noun eo·sin \ ˈē-ə-sən \
variants: or less commonly eosine play \ˈē-ə-sən, -ˌsēn\

Definition of eosin

1 :a red fluorescent dye C20H8Br4O5 obtained by the action of bromine on fluorescein and used especially in cosmetics and as a toner; also :its red to brown sodium or potassium salt used especially as a biological stain for cytoplasmic structures
2 :any of several dyes related to eosin

Origin and Etymology of eosin

International Scientific Vocabulary, from Greek ēōs dawn


Medical Dictionary

eosin

noun eo·sin \ ˈē-ə-sən \
variants: also eosine play \-sən, -ˌsēn\

medical Definition of eosin

1 :a red fluorescent dye C20H8Br405 obtained by the action of bromine on fluorescein and used especially in cosmetics and as a toner; also :its red to brown sodium or potassium salt used especially as a biological stain for cytoplasmic structures
2 :any of several dyes related to eosin

Learn More about eosin


Seen and Heard

What made you want to look up eosin? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to praise usually to excess

Get Word of the Day daily email!

Test Your Vocabulary

Find the Cousins

  • a-large-tree-with-many-branches
  • Which pair shares a common word ancestor?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!