\Jac"o*bin\, n. [F. See 2d {Jack}, {Jacobite}.]
1. (Eccl. Hist.) A Dominican friar; -- so named because,
   before the French Revolution, that order had a convent in
   the Rue St. Jacques, Paris.
2. One of a society of violent agitators in France, during
   the revolution of 1789, who held secret meetings in the
   Jacobin convent in the Rue St. Jacques, Paris, and
   concerted measures to control the proceedings of the
   National Assembly. Hence: A plotter against an existing
   government; a turbulent demagogue.
3. (Zo["o]l.) A fancy pigeon, in which the feathers of the
   neck form a hood, -- whence the name. The wings and tail
   are long, and the beak moderately short.

\Jac"o*bin\, a.
Same as {Jacobinic}.