Source : Webster's Revised Unabridged Dictionary (1913)

Crocein \Cro"ce*in\ (kr?"s?-?n), n. [See {Croceous}.] (Chem.)
   A name given to any one of several yellow or scarlet
   dyestuffs of artificial production and complex structure. In
   general they are diazo and sulphonic acid derivatives of
   benzene and naphthol.