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The Collaborative International Dictionary
Polyperythrin

Polyperythrin \Pol`y*pe*ryth"rin\, n. [Polyp + Gr. ? red.] (Physiol. Chem.) A coloring matter found in many simple Anthozoa and some hydroids.

Wiktionary
polyperythrin

n. (context biochemistry English) A pigment found in many simple Anthozoa and some hydroids.