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Webster 1913 Edition
Erythrite
E-ryth′rite
,Noun.
 [Gr. 
ἐρυθρόσ 
red.] 1. 
(Chem.) 
A colorless crystalline substance, 
C4H6.(OH)4
, of a sweet, cooling taste, extracted from certain lichens, and obtained by the decomposition of erythrin; – called also erythrol
, erythroglucin
, erythromannite
, pseudorcin
, cobalt bloom
, and under the name phycite 
obtained from the alga Protococcus vulgaris
. It is a tetrabasic alcohol, corresponding to glycol and glycerin.  2. 
(Min.) 
A rose-red mineral, crystallized and earthy, a hydrous arseniate of cobalt, known also as 
cobalt bloom
; – called also erythrin 
or erythrine
.