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ATP vs. ADP

ATP

[ey-tee-pee] / ˈeɪˈtiˈpi /

abbreviation

Biochemistry.

adenosine triphosphate: an ester of adenosine and triphosphoric acid, C 10 H 12 N 5 O 4 H 4 P 3 O 9 , formed especially aerobically by the reaction of ADP and an orthophosphate during oxidation, or by the interaction of ADP and phosphocreatine or certain other substrates, and serving as a source of energy for physiological reactions, especially muscle contraction.

ADP

[ey-dee-pee] / ˈeɪˈdiˈpi /

abbreviation

Also called adenosine diphosphoric acid. Biochemistry. adenosine diphosphate: an ester of adenosine and pyrophosphoric acid, C 10 H 12 N 5 O 3 H 3 P 2 O 7 , derived from ATP, and serving to transfer energy during glycolysis.
Computers. automatic data processing: the processing of data by computers or related devices, using techniques that reduce human intervention to a minimum.