\Neu"rine\ (? or ?), n. [Gr. ? a nerve.] (Physiol.
Chem.)
A poisonous organic base (a ptomaine) formed in the
decomposition of protagon with boiling baryta water, and in
the putrefraction of proteid matter. It was for a long time
considered identical with choline, a crystalline body
originally obtained from bile. Chemically, however, choline
is oxyethyl-trimethyl-ammonium hydroxide, while neurine is
vinyl-trimethyl-ammonium hydroxide. [Written also {neurin}.]