Guanidine \Gua"ni*dine\, n. (Physiol. Chem.)
A strongly alkaline base, {NH2.CNH.NH2}, formed by the
oxidation of guanin, and also obtained combined with methyl
in the decomposition of creatin. Boiled with dilute sulphuric
acid, it yields urea and ammonia.
[1913 Webster]