noun
also aden·o·sine·di·phos·phor·ic acid -|dīˌfä|sfȯrik-
: an ester C 10 H 12 N 5 O 3 H 3 P 2 O 7 of adenosine and pyrophosphoric acid that is formed in living cells as an intermediate between adenosine triphosphate and adenylic acid, its formation from the triphosphate by loss of phosphate leading especially to a transfer of energy to other compounds in glycolysis, and that reacts in muscle tissue with phosphocreatine or phosphoarginine to regenerate adenosine triphosphate — called also ADP