Definition of creatine
: a white crystalline nitrogenous substance C4H9N3O2 found especially in the muscles of vertebrates either free or as phosphocreatine
also
: a synthetic usually hydrated form of creatine taken especially as a dietary supplement
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Merriam-Webster unabridged
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Time Traveler for creatine
The first known use of creatine was in 1840
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