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[ee-uh-sin] /ˈi ə sɪn/
noun, Chemistry.
Also called bromeosin, tetrabromofluorescein. a red, crystalline, water-insoluble solid, C 20 H 8 Br 4 O 5 , 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, eosine
[ee-uh-sin, -seen] /ˈi ə sɪn, -ˌsin/ (Show IPA)
Origin of eosin
1865-70; < Greek ēṓs dawn (see eo-) + -in2
Related forms
eosinic, adjective
eosinlike, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for eosin


Also called bromeosin. a red crystalline water-insoluble derivative of fluorescein. Its soluble salts are used as dyes. Formula: C20H8Br4O5
any of several similar dyes
Derived Forms
eosinic, adjective
eosin-like, adjective
Word Origin
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
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eosin in Medicine

eosin e·o·sin (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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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