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Meaning of phosphagen

phos•pha•gen

Pronunciation: (fos'fu-jun, -jen"), [key]
— n. Biochem.
  1. a high-energy phosphoric ester that serves as a reservoir of phosphate-bond energy, as phosphocreatine in vertebrates and phosphoarginine in invertebrates.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.