atp Atoxyl • at peace · · · Info · Definitions · Synonyms · Characters · · atp · · Text Latin · · Script 3 · · Length 1 · · Syllables Definitions · · · (noun) a nucleotide derived from adenosine that occurs in muscle tissue; the major source of energy for cellular reactions. Synonyms: adenosine triphosphate, ATP. · · Noun Definition 1 Synonyms · · · adenosine triphosphate · · Synonym 1 Characters · · a latin small letter a U+0061 p latin small letter p U+0070 t latin small letter t U+0074