\Leu"cin\ (l[=u]"s[i^]n), n. [Gr. leyko`s white.]
(Physiol. Chem.)
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.