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From The Collaborative International Dictionary of English v.0.48:
Murexide \Mu*rex"ide\, n. [L. murex the purple fish, purple.] (Chem.) A crystalline nitrogenous substance (C8H8N6O6, 5-5'-nitrilodibarbituric acid monoammonium salt) having a splendid dichroism, being green by reflected light and garnet-red by transmitted light. It was formerly used in dyeing calico, and was obtained in a large quantities from guano. It is now synthesized from alloxan. Formerly called also ammonium purpurate. [1913 Webster +PJC]