eosin

[ee-uh-sin]

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.

Also e·o·sine

[ee-uh-sin, -seen] /ˈi ə sɪn, -ˌsin/.

Origin of eosin

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

Related formse·o·sin·ic, adjectivee·o·sin·like, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for eosine

Historical Examples of eosine

The dyes with the ponceaus are faster than those with eosine or safranine.
The Practical Ostrich Feather Dyer
Alexander Paul
The eosine plate was underexposed, but brought up everything fairly well except the scarlet hat, which came up like black.
Scientific American Supplement, No. 492, June 6, 1885
Various
Very good results in soap may be obtained by mixing a fast blue, as ultramarine or cobalt blue, with a red as rhodamine or eosine.
Soap-Making Manual
E. G. Thomssen
In the latter mixture they stain really with the methylene blue salt of eosine.
Histology of the Blood
Paul Ehrlich
Potassa turns rosolic acid and coralline from an orange-red to a bright red, while it produces no change in eosine.
Scientific American Supplement, No. 363, December 16, 1882
Various

British Dictionary definitions for eosine

eosin

eosine (ˈiːəʊsɪn, -ˌsiːn)

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 Formseosinic, 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

eosine in Medicine

eosin

[ē′ə-sən]

Any of a class of red acid dyes of the xanthene group used as cytoplasmic stains and as counterstains, especially the sodium and potassium salts of certain of these dyes.