Definify.com
Webster 1913 Edition
Erythrine
{ 
, E-ryth′rin
,E-ryth′rine
}Noun.
 [Gr. 
ἐρυθρόσ 
red.] 1. 
(Chem.) 
A colorless crystalline substance, 
C20H22O10
, extracted from certain lichens, as the various species of Rocella
. It is a derivative of orsellinic acid. So called because of certain red compounds derived from it. Called also erythric 
acid.