eosin

[ ee-uh-sin ]

/ ˈi ə sɪn /

Save This Word!

noun Chemistry.

Also called bromeosin, tetrabromofluorescein. a red, crystalline, water-insoluble solid, C20H8Br4O5, derived from fluorescein by bromination: used chiefly as an acid dye for dyeing silk a rose red color and as a histological stain.

any of a variety of eosinlike dyes.

QUIZ

THINGAMABOB OR THINGUMMY: CAN YOU DISTINGUISH BETWEEN THE US AND UK TERMS IN THIS QUIZ?

Do you know the difference between everyday US and UK terminology? Test yourself with this quiz on words that differ across the Atlantic.

Question 1 of 7

In the UK, COTTON CANDY is more commonly known as…

candystring

candyfloss

candypuff

TAKE THE QUIZ TO FIND OUT

Also e·o·sine

[ee-uh-sin, -seen]. /ˈi ə sɪn, -ˌsin/.

Origin of eosin

1865–70; <Greek ēṓs dawn (see eo-) + -in²

OTHER WORDS FROM eosin

e·o·sin·ic, adjectivee·o·sin·like, adjective

Words nearby eosin

eonian, eonism, eo nomine, EOP, Eos, eosin, eosinophil, eosinophilia, eosinophilic, Eötvös, Eötvös experiment

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use eosin in a sentence

Inside the ABS carrying case, you’ll also find a pair of tweezers, collecting vials, a Petri dish, prepared slides, Eosin dye, and more.
The best microscopes for kids of 2022|Carsen Joenk|May 21, 2022|Popular-Science
Other counterstains may be used such as dilute eosin, dilute fuchsin, or vesuvin.
The Elements of Bacteriological Technique|John William Henry Eyre
Wassermann made several eosin preparations, by coupling the sodium derivative with potassium selenocyanide.
Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and its derivatives|Y-Gwan Chen
The eosin and the selenium were then combined by a method and in a form the details of which have never been published.
The Propaganda for Reform in Proprietary Medicines, Vol. 2 of 2|Various

In this respect, therefore, they were entirely comparable with the eosin-selenium compound.
The Propaganda for Reform in Proprietary Medicines, Vol. 2 of 2|Various
Wassermanns results with eosin-selenium were soon critically examined by other observers.
The Propaganda for Reform in Proprietary Medicines, Vol. 2 of 2|Various

British Dictionary definitions for eosin

eosin

eosine (ˈiːəʊsɪn, -ˌsiːn)

/ (ˈiːəʊsɪn) /

noun

Also called: bromeosin a red crystalline water-insoluble derivative of fluorescein. Its soluble salts are used as dyes. Formula: C 20 H 8 Br 4 O 5

any of several similar dyes

Derived forms of eosin

eosinic, adjectiveeosin-like, adjective

Word Origin for eosin

C19: from Greek ēōs dawn + -in; referring to the colour it gives to silk

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012