Webster's English Dictionary

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eosin

eo.sin or eo.sine \'e--*-s*n\ \-s*n, -.se-n\ n [ISV, fr. Gk e-o-s dawn] 1: 
   a red fluorescent dye C20H8Br4O5 obtained by the  action of bromine on 
   fluorescein and used esp. in cosmetics and as a toner; also : its red to 
   brown sodium or potassium salt used esp. in pink or red organic pigments 2: 
   any of several dyes related to eosin