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ADP

noun

1. acronym for adenosine diphosphate, a nucleotide made up of adenine, ribose, and two phosphate units; having a molecular formula: C₁₀H₁₅N₅O₁₀P₂

2. the product of ATP de-phosphorylation via ATPases to release energy; and can be converted to ATP by phosphorylation (addition of phosphate and energy) via ATP synthases to store energy.