Source : Webster's Revised Unabridged Dictionary (1913)

Phycoerythrin \Phy`co*e*ryth"rin\, Phycoerythrine
\Phy`co*e*ryth"rine\, n. [Gr. ? seaweed + E. erythrin, -ine.]
   A red coloring matter found in alg[ae] of the subclass
   {Floride[ae]}.

Source : WordNet®

phycoerythrin
     n : red pigment in red algae