1. 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: creatine, creatin]
WordNet (r) 3.0 (2006):
creatine
n 1: 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: creatine, creatin]