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Wiktionary Word definitions in Wiktionary
n. (context biochemistry English) An amino acid ''2-(carbamimidoyl-methyl- amino)acetic acid'' which naturally occurs in vertebrates and helps to supply energy to muscle and nerve cells

Wikipedia Word definitions in Wikipedia
Creatine ( or ) is a nitrogenous organic acid that occurs naturally in vertebrates and helps to supply energy to all cells in the body, primarily muscle . This is achieved by increasing the formation of adenosine triphosphate (ATP). Creatine was identified ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1834, from French creatine , from Greek kreas "flesh, meat" (see raw ) + chemical suffix -ine (2). Organic base discovered by French physicist Michel-Eugène Chevreul (1786-1889) in the juice of flesh and named by him.

WordNet Word definitions in WordNet
n. an amino acid that does not occur in proteins but is found in the muscle tissue of vertebrates both in the free form and as phosphocreatine; supplies energy for muscle contraction [syn: creatin ]