eosin

[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

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

Related forms

eosinic, adjective

eosinlike, adjective

British Dictionary definitions for eosin

eosin

/ˈiːəʊsɪn/

noun

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

eosin in Medicine

eosin e·o·sin (ē'ə-sən)
n.
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.