A white, crystalline, nitrogenous substance formed in the
   decomposition of albuminous matter by pancreatic digestion, by the
   action of boiling dilute sulphuric acid, and by putrefaction. It is
   also found as a constituent of various tissues and organs, as the
   spleen, pancreas, etc., and likewise in the vegetable kingdom.
   Chemically it is to be considered as amido-caproic acid.